Exoplanets, Dust, and Who Sees Data First?

NASA/Ames/JPL-Caltech's diagram, comparing the Solar System and Kepler-22's planetary system. (2011)
Comparison: Kepler-22 planetary system and inner Solar System. (2011)

It’s been a little over 10 years since scientists spotted Kepler-22 b. It was the first time we’d spotted a transiting exoplanet that’s in its sun’s habitable zone.

That may or may not mean that Kepler-22 b is habitable. The odds are good that the exoplanet is a water world: covered with an ocean far deeper than Earth’s.

Since then we’ve discovered quite a few water worlds. And, possibly because there’s a 1995 action film called “Waterworld”, they’re often called ocean worlds.1

This week I’ll talk about two (probably) ocean worlds, Kepler-138 c and d; discovered in 2014, they’re far to hot for life as we know it. But scientists recently published a new analysis of those two worlds. And that gave me something to talk about.

So did a proposed change in when taxpayer-funded research projects release data. It’s good news or bad news, depending on who’s talking. That’s this week’s first item.

I’ll also look at a very young planetary system’s dust disk, the odds for life on ocean planets, and assorted other topics:


Sharing Information, and a Newfangled Idea

NASA, ESA, CSA, STScI's image: the Southern Ring Nebula, one of the first James Webb Space Telescope images released to the public. (2022)
The Southern Ring Nebula, image from the James Webb Space Telescope. (2022)

What’s the fairest way to share cosmic views from Hubble and James Webb telescopes?
Nell Greenfieldboyce, NPR (February 7, 2023)

“The managers of the James Webb Space Telescope are considering a big change in how its observations get shared, one that could have a major impact on the science that gets done — and on who gets to do it.

“As it stands now, if an astronomer makes a proposal for where to point this $10 billion space telescope, and the proposal gets accepted, that scientist usually has a year of exclusive access to the resulting observations.

“Now, though, with the federal government pushing for more taxpayer-funded research to be made public instantly, telescope managers are pondering whether all of the data collected by JWST should be available to everyone right away….”

“…with the federal government pushing…” apparently refers to a White House press release and a memo:

On the whole, I like the idea of having access to information I’ve paid for: as soon as it’s in viewable or readable form, not a year of mofd later.

The pandemonium that passes for politics being what it is, an explanation may be in order.

Access to Information

Map of Internet censorship and surveillance by country (2018)I think having access to information is generally a good idea. After a quick glance at that memo, I think this change in the rules might make sense.

But that doesn’t mean that I think the memo is unquestionably right and just, simply because it came from someone in the current administration. And that anyone who doesn’t agree is a doo-doo-head.

On the other hand, I’m not absolutely sure it’s a good idea.

Which doesn’t mean I think the memo is an assault on all that is right and just — because, again, the memo was written by someone working for the current administration. And that anyone who exhibits insufficient revulsion is a traitor to the fatherland.

I’d be delighted of more folks would take a deep breath, consider the possibility that knee-jerk responses aren’t always reasonable: and think! And that’s another topic.

At any rate, some folks like the proposed new rules; and some don’t.

“…Proponents of open access say that sharing all of these space telescopes’ findings immediately could accelerate new discoveries and maximize the return from these powerful scientific assets.

“Critics, however, worry that this could exacerbate existing inequities in who gets to do astronomical research, and perhaps even result in shoddier science as scientists race to be first to find hidden gems in the data….”
(Nell Greenfieldboyce“, NPR (February 7, 2023)

‘We’ve Never Done It This Way Before’

Getty Images: Nature magazine, via BBC News. 'Scientific journals can play a role in helping improve the reliability of reporting' (February 22, 2017)The “shoddier science” argument may have merit. But I’m not entirely convinced.

Scientists are human, and occasionally publish bogus results: intentionally or not.

Letting folks who aren’t insiders see fresh data would, I suspect, be at least as likely to disprove dubious analyses as it would be to inspire another Archaeoraptor SNAFU.2

And I also suspect that some protests come, consciously or not, from a perceived affront to cherished traditions.

“…Astronomers have turned their telescopes to the skies for hundreds of years. Traditionally, they decided how and when to share their records of what they’d seen.

“The data really were more or less owned by the person who came up with the idea to take the observations in the first place,” says Eric Smith, associate director for research at the astrophysics division of NASA’s science mission directorate in Washington, DC.

“An astronomer who used a ground telescope physically possessed their records.

“‘Originally it was just hand drawings, and then it became glass plates, and then it was film in some cases, and eventually it was magnetic tapes,’ explains Smith. ‘Whoever went to the observatory took those data home with them — and they just put them in their office or they put them in some university vault.’…”
(Nell Greenfieldboyce, NPR (February 7, 2023))

My guess is that either now or later, observations from multinational projects like the Hubble and James Webb space telescopes will be distributed sooner than they are now.

That’s mainly because it strikes me that trends have been going that way for decades.

And maybe because I hope that I’ll get a look at data earlier than I could have before.


AU Microscopii’s Dusty Disk: A Close Look, in Infrared

Hubble Space Telescope NIRCam images: AU Microscopii's dust disk at 3.56 and 4.44 microns with polarizing filters F606W (V) (POL0V, POL60V, and POL120V). (August 1, 2004) Credit: NASA, ESA, J. R. Graham and P. Kalas (University of California, Berkeley), and B. Matthews (Hertzberg Institute of Astrophysics)
JWST NIRCam images at 3.56 (blue) and 4.44 (red) microns. (August 1, 2004)

New Webb Image Reveals Dusty Disk Like Never Seen Before
Laura Betz, Claire Blome, Christine Pulliam, Madison Arnold; NASA’s Goddard Space Flight Center, Greenbelt, Maryland; Space Telescope Science Institute, Baltimore, Maryland; NASA (January 11, 2023)

“NASA’s James Webb Space Telescope has imaged the inner workings of a dusty disk surrounding a nearby red dwarf star. These observations represent the first time the previously known disk has been imaged at these infrared wavelengths of light. They also provide clues to the composition of the disk.

“The star system in question, AU Microscopii or AU Mic, is located 32 light-years away in the southern constellation Microscopium. It’s approximately 23 million years old, meaning that planet formation has ended since that process typically takes less than 10 million years. The star has two known planets, discovered by other telescopes. The dusty debris disk that remains is the result of collisions between leftover planetesimals – a more massive equivalent of the dust in our solar system that creates a phenomenon known as zodiacal light….”

AU Microscopii’s designation has little or nothing to do with it being small. It’s in the southern constellation Microscopium.

That patch of sky had been the rear hooves of Sagittarius until the early 1750s, when Nicolas-Louis de Lacaille mapped more than a dozen new constellations, including:

  • Antlia pneumatica (la Machine Pneumatique/the Pneumatic Machine)
  • Apparatus Sculptoris (the sculptor’s studio)
  • Circinus, Norma (compass)
  • Fornax chemical (chemical furnace)
  • Horologium (clock (lit. “an instrument for telling the hour”))
  • Microscopium (microscope)
  • Norma (carpenter’s square, set square or level)
  • Octanis/Octans (octant)
  • Pictor (painter)
  • Pyxis nautica (mariner’s compass)
  • Reticulus rhomboidalis (Reticulum) (the reticle in Lacaille’s telescope eyepiece)
  • Mons Menae (Mensa: originally Table Mountain, later Table)
  • Telescopium (telescope)
    (Source: Nicolas-Louis de Lacaille, Biographies, MacTutor History of Mathematics Archive, University of St. Andrews, Scotland; Wikipedia)

Many of them were named after scientific instruments, which were all the rage in the Age of Enlightenment, and I’m drifting off-topic.

AU Microscopii’s planetary system — it’s got two known planets, roughly 10 and 20 times Earth’s mass — is very new.3

All that dust probably is, as the NASA article said, from leftover planetesimals. But we may learn differently. That’s happened before, and I figure it’ll happen gain.

Take what we’re learning about the inner Solar System’s zodiacal light, for example.

A Zodiacal Digression

Illustration from J. Otto's 'Ottův Slovník Naučný', 'Otto's Educational Dictionary'. (1908)Zodiacal light is a cone of light barely visible before dawn and after sunset, near the sun.

It’s a very faint band of light running along the ecliptic.

A brighter bit, opposite the sun, is gegenschein or counterglow.

Which definition of zodiacal light is in play depends on who’s talking. In my experience, at any rate.

Scientists figure zodiacal light comes from a pancake-shaped dusty area surrounding the Solar System’s inner planets. Or maybe a really flat doughnut.

Either way, it’s called the zodiacal cloud or interplanetary dust cloud.

Where the dust comes from is debatable and debated. Particularly now that we’ve got data from a spacecraft that was looking for something else: Juno.

NASA/JPL-Caltech/SwRI/MSSS' image from the Juno spacecraft: 'Juno took this picture as it flew over the north pole, from a distance of 195,000km' (September 2, 2016) via Jonathan Amos, BBC News, used w/o permissionBefore the Juno spacecraft headed for Jupiter, scientists generally figured that the dust was from asteroids and comets.

Juno’s mission didn’t include observing space-dust. But getting useful data from its magnetometer depended on the spacecraft knowing which way it was pointed.

That’s why Juno had four star trackers, cameras that took pictures every quarter-second, and a simple AI that compared the views with known stars and other objects.

Technical University of Denmark professor John Leif Jørgensen had programmed one of Juno’s four star trackers to send back a picture whenever an uncataloged object showed up more than once.

Jørgensen had hoped Juno would spot a previously-uncharted asteroid.

Serendipitous Juno Detections Shatter Ideas About Origin of Zodiacal Light” Lonnie Shekhtman et al., JPL/NASA (March 9, 2021)

“…He didn’t expect to see much: Nearly all objects in the sky are accounted for in the star catalog. So when the camera started beaming down thousands of images of unidentifiable objects – streaks appearing then mysteriously disappearing – Jørgensen and his colleagues were baffled. ‘We were looking at the images and saying, ‘What could this be?”‘ he said.

“…It wasn’t until the researchers calculated the apparent size and velocity of the objects in the images that they finally realized something: Dust grains had smashed into Juno at about 10,000 miles (or 16,000 kilometers) per hour, chipping off submillimeter pieces of spacecraft. ‘Even though we’re talking about objects with only a tiny bit of mass, they pack a mean punch,’ said Jack Connerney, Juno’s magnetometer investigation lead and the mission’s deputy principal investigator, who’s based at NASA’s Goddard Space Flight Center in Greenbelt, Maryland….”

Long story short, Juno made it through the unexpected ‘dust storm’. Mainly because most of the impacts were on the comparatively rugged back side of the spacecraft’s solar panels.

The best fit for explaining all that dust was that it was coming from Mars. Some scientists figure the recent analysis is accurate. Others don’t.4 Which is about par for the course, when we find new data that doesn’t fit existing explanations.

A Dust Disk by Starlight: Polarized Light, Oscillations and Weird Ripples

NASA, ESA, J. R. Graham and P. Kalas (University of California, Berkeley), and B. Matthews (Hertzberg Institute of Astrophysics)'s image of AU Microscopii's dust/debris disk; from Hubble Space Telescope (August 1, 2004) through filters Filters F606W (V), (POL0V, POL60V, and POL120V). Scale in AU, size of Neptune's orbit, location of star and occulting disk added.
Hubble image of AU Microscopii debris/dust disk (August 1, 2004)

At this point, I’d like to start sharing what the new images of AU Microscopii’s dust disk tell us about how stars and planets form, what causes the weird ripples — I’ll get back to that — and how it ties into our search for life on other worlds.

But I can’t. The most recent analysis I found said, basically, that we’ve been learning a great deal about how data like this should be analyzed.

They also said they’d found evidence of silicates like MgFeSiO4, carbon and tholins: organic compounds that happen when ultraviolet light or cosmic rays hit simpler compounds like carbon dioxide (CO2), methane, (CH4) or ethane (C2H6). Nitrogen (N2) or water (H2O) are part of the process, too, often enough.5

And that’s enough chemical geek-speak for now.

Here’s an excerpt from what scientists found in a new “snapshot” of AU Microscopii’s debris/dust disk.

Hubble’s Snapshot of Debris Disk Around Young Star
J. R. Graham and P. Kalas (University of California, Berkeley), and B. Matthews (Hertzberg Institute of Astrophysics); ESA/NASA; Images, Resource Gallery, HubbleSite (January 7, 2007)

“…The image shows the flattened disk, appearing like Saturn’s rings, but seen almost exactly edge-on. Normally, starlight would be so bright that the debris disk could not be seen. But astronomers used the coronagraph on Hubble’s Advanced Camera for Surveys, which blocked out most of the starlight. The black circle in the center of the image is the coronagraph’s occulting disk. The disk in this image extends to about 8 billion miles from the star, or three times farther than Neptune is from the Sun. In other observations, the disk has been traced to at least 11 billion miles.

“The only light seen is starlight reflected off dust in the debris disk. Astronomers used polarizing filters on the Advanced Camera to analyze the dust in the disk. The polarizing filters allowed astronomers to study how dust is reflecting the starlight. A polarizing filter lets through light vibrating in one orientation while blocking light oscillating in other directions. The white lines in the bottom image illustrate the direction a light wave is oscillating. The length of the line represents the degree to which all the light waves are oscillating in the same direction….”

I think a key word here is “oscillating.” AU Microscopii is close enough for us to get a good look at the star’s planetary system, dust included. And even get the occasional video.

These “mysterious ripples” are weird. Which, for scientists, is a very good thing.

Mysterious Ripples Found Racing Through Planet-forming Disk
Ray Villard, Space Telescope Science Institute, Baltimore, Maryland; Lynn Jenner, Editor; Hubble, NASA (October 7, 2015; last updated August 6, 2017)

“…The fast-moving, wave-like structures are unlike anything ever observed, or even predicted in a circumstellar disk, said researchers of a new analysis. This new, unexplained phenomenon may provide valuable clues about how planets form inside these star-surrounding disks….”

I’d be astounded if we don’t learn something from those ripples. Although I suspect “waves” or maybe “spurts” is a better term.

And I’m pretty sure that we’ll learn more from comparing the AU Microscopii system’s cloud to similar features in other systems.

Hot Jupiters, Planetary Migration: And Much More Left to Learn

NASA, ESA, ESO, A. Boccaletti (Paris Observatory)'s images: AU Microscopii's 40 billion-mile diameter edge-on disk, showing ripples moving across the disk at about 22,000 miles per hour: something that's not been seen before. (2010-2014)
AU Microscopii’s dust disk, with ripples traveling 22,000 miles per hour. (2010-2014)
This phenomenon had not been observed before, and had not been predicted.

B. Saxton (NRAO/AUI/NSF)/ALMA (ESO/NAOJ/NRAO)'s images of dust disks around nine young stars, from SPHERE instrument on ESO's Very Large Telescope. (April 2018)The nebular hypothesis is still the best, or least-unlikely, explanation for how our Solar System and other planetary systems take shape. But it’s still called a hypothesis.

How long it’ll take scientists to either confirm the nebular hypothesis, or show that it doesn’t work: that, I don’t know.

I’m pretty sure, though, that the process will take less time now. Before, we had only one planetary system to study. Now we have thousands.

Of those, dozens (at least) have dust disks. I’m not sure if that includes protoplanetary disks and proplyds: ionized protoplanetary disks.

The point is that we’ve gone from studying one example of a ‘finished’ planetary system, to studying thousands. Some of them are really weird, which gives scientists opportunities for learning something new.

Hot Jupiters, for example, encouraged — demanded? — new explanations for how planets end up where we find them.

Turns out that planets can and do move into new orbits, particularly when planetary systems are new. It’s called “planetary migration.”

The process is also complicated, and very likely explains how Earth’s Moon formed. I like to call it “playing bumper cars with planets”.

Finally, we’ve found dozens of planetary systems, at least, that are in very early stages of development: like AU Microscopii’s.6

As I’ve said before, and will again, there’s a great deal left to learn.

Zodiacs, Dust and Loose Ends

Now, mainly because I think it’s cool, here’s link to a NASA Goddard video with music by Vangellis. It talks about interplanetary dust, Mars and Jupiter.

Our Solar System’s zodiacal cloud isn’t unique. Astronomers have been spotting interplanetary dust clouds (“exozodiacal dust”) in other planetary systems.

Let’s see. What else?

The “zodiac” is a band of constellations running along the ecliptic. The ecliptic is Earth’s orbital plane, or the line where that plane meets the celestial sphere.

Steve Zodiac is the name of a character in the 1960s science fiction puppet show “Fireball XL5”, and guitarist and songwriter Stephen John Hepworth’s stage name. All of which are yet more topics.7


Kepler-138 c, d: “Water, Water Everywhere?”

Benoit Gougeon's (University of Montreal) 'illustration showing a cross-section of the Earth (left) and the exoplanet Kepler-138 d (right). Like the Earth, this exoplanet has an interior composed of metals and rocks (brown portion), but Kepler-138 d also has a thick layer of high-pressure water in various forms....' (2022)
Benoit Gougeon’s illustration: Earth (left) and Kepler-138 d (right). (2022)

Two Exoplanets May Be Mostly Water, NASA’s Hubble and Spitzer Find
Claire Andreoli, NASA’s Goddard Space Flight Center, Greenbelt, Maryland; Ray Villard, Space Telescope Science Institute, Baltimore, Maryland; Marie-Eve Naud, Trottier Institute for Research on Exoplanets, University of Montreal, Montreal, Canada; Caroline Piaulet, Trottier Institute for Research on Exoplanets, University of Montreal, Montreal, Canada; Björn Benneke, Trottier Institute for Research on Exoplanets, University of Montreal, Montreal, Canada; Editor Andrea Gianopoulos; Hubble; NASA (last updated December 15, 2022)

“A team led by researchers at the University of Montreal has found evidence that two exoplanets orbiting a red dwarf star are ‘water worlds,’ where water makes up a large fraction of the entire planet. These worlds, located in a planetary system 218 light-years away in the constellation Lyra, are unlike any planet found in our solar system.

“The team, led by Caroline Piaulet of the Trottier Institute for Research on Exoplanets at the University of Montreal, published a detailed study of this planetary system, known as Kepler-138, in the journal Nature Astronomy today….”

The article’s two exoplanets are Kepler-138 c and d. They’re both about 1.5 times Earth’s diameter, but only 2.3 (Kepler-138 c) and 2.1 (Kepler-139 d) times Earth’s mass: give or take a bit.

That means they’re a whole lot less dense than Earth. The scientists are pretty sure of their data, which includes observations with the Keck Observatory’s High Resolution Echelle Spectrometer. And if I go down that rabbit hole, I’ll never get this thing finished in time.

The Kepler-138 planetary system has at least one more planet, Kepler-138 b, and maybe a fourth: Kepler-138 e.

Kepler-138 b is a little over half Earth’s diameter and almost certainly a rocky world, like the Solar System’s inner planets.

Kepler-138 e may or may not be there. Its existence hasn’t been confirmed, but if it is, it’ll be near the inner edge of the system’s habitable zone.

The other three planets — b, c, and d — are between the habitable zone and their sun: too hot for life. As we know it, at any rate, and that’s yet again another topic.

More like Enceladus than Earth, But Not Quite Like Either

NASA's illustration, showing the likely inner structure of Enceladus. (2017) via BBC News, used w/o permission.There aren’t any planets like Kepler-138 c and d in the Solar System. But some of the outer Solar System’s moons are similar.

Saturn’s Enceladus, for example, has an ocean that’s around 26 to 31 kilometers deep: 16 to 19 miles.

By comparison, Earth’s ocean has an average depth of 3.7 kilometers. Or 3,682 meters, if you’re into three-decimal-place accuracy. That’s on average.

Some parts of Earth’s ocean are more than 10,000 meters, 32808.4 feet deep. And its depth at the shore goes down to zero. Or would that be up to zero? Never mind.

Earth’s ocean is covered by ice around the north pole; and would be at the south pole, if Antarctica wasn’t there. Enceladus, on the other hand, is covered by a thickish ice crust: but not thick enough to keep geysers from happening at the south pole.

Kepler-138 c and d are too hot for an ice crust like Enceladus’, or ice caps like Earth’s.

They might, however, have very hot oceans under an atmosphere that’s mostly steam.8

This NASA video gives a pretty good — and, at 89 seconds, short — overview of why scientists think Kepler-138 c and d are “water worlds”, or ocean planets:

Too Much of a Good Thing: or Maybe Not

Natalie Batalha's and Wendy Stenzel's chart of exoplanet populations found with Kepler data. (2017) (NASA and Ames Research Center)Life needs water, but water worlds or ocean planets may have too much of a good thing.

Then again, maybe not.

Life needs water, but it doesn’t just need water: besides an energy source, living critters need chemicals dissolved in water. In a sense, living critters are chemicals dissolved in water.

Rainwater falling on Earth’s land surfaces picks up elements and compounds, eventually delivering them to the ocean. With no land surfaces, an ocean planet might have too little stuff — particularly phosphorus — dissolved in its water to support life. Or get life started.

Besides having no rocky surface above water level, the liquid water of ocean planets might have no contact with the rocky surface below them. Water that’s at the ocean’s floor would be under extreme pressure.

At extreme pressures, water can turn to ice at very high temperatures. Weird ice, but quite solid enough to keep the rock below from dissolving.

And it gets worse, maybe. Some scientists crunched numbers, and found that an ocean planet’s rocky crust and mantle might be under so much pressure that the planet’s interior couldn’t get fluid enough to start geological process that recycle chemicals here on Earth

On the other hand, scientists from the University of Chicago and Penn State crunched other numbers: and got a fair number of virtual ocean planets that were life-friendly.

It’s far too early to tell whether ocean planets can be habitable. As far as I can tell, that is.

The consensus seems to be that we need more data. Which, happily, keeps coming in.9


Wolf 1069-b, Very Briefly

Roger Sinnott, Rick Fienberg's IAU /Sky and Telescope magazine sky map: Cygnus. (June 5, 2011)I’m forgetting something.

Let me think — Right! A planet.

Last week I mentioned Wolf 1069 b, an exoplanet orbiting Wolf 1069: which is also called GJ 1253 or Glies 1253.

Anyway, Wolf 1069 b is in its star’s habitable zone. Its minimum mass is about the same as Earth’s. It doesn’t cross its sun’s face from where we are, and it orbits a red dwarf star.

Wolf 1069 is in the north end of Cygnus, in the same general direction as Eta Cephei, but closer: a little over 31 light-years, compared to Eta Cephei’s 46 and a half.

That makes Wolf 1069 b the sixth-closest roughly-Earth-Mass exoplanet that’s inside a conservatively-defined habitable zone.10


Coming Attractions

Alejandro Suárez Mascareño's and Inés Bonet's (IAC) impression of GJ 1002's two Earth-mass planets.I had more left to say about GJ 1002 b and c last week.

They’re maybe-habitable worlds orbiting a red dwarf that’s about 16 light-years away.

One of the points I was going to talk about was tidal locking: the situation that has Earth’s Moon always facing Earth, and Mercury rotating three times for every two revolutions/orbits around the Sun.

Meanwhile, I’ve found a recent article about Wolf 1069 b.11

After a little rummaging through my digital archives, I also found a paper from 2013 that discussed conditions on a hypothetical planet with an extensive ocean in a red dwarf’s habitable zone.

The 2013 paper shows how ocean currents and wind could cool a tidally-locked planet’s day side and warm the part where it’s always night. And the researchers’ analysis gave the hypothetical planet a vaguely lobster-shaped area of open water on the day side.

I’ll either talk about that next week, or give you a break and look at something besides exoplanets and our ongoing search for extraterrestrial life.

If you’ve got a preference one way or the other, feel free to say so in a comment.

No guarantees made or implied, though, 😉 since looking at something else depends on finding something else. That said, this bit of weirdness, a nearly-complete fossilized skeleton found in Germany, has possibilities:

More about exoplanets, life and how we’ve been naming stars:


1 Strange new worlds, science and an action film:

2 Sometimes repeatable results aren’t, and data isn’t real:

3 A star, an astronomer, and planets under construction:

4 Zodiacal miscellanea:

5 Life’s building blocks and a dust cloud:

6 Learning how planetary systems form:

7 more miscellanea:

8 Oceans and astronomy:

9 Oceans in the sky:

10 Wolf 1069, mostly:

11 Tides and tidally-locked worlds:

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Technical Difficulties

I have a post ready. It should have been online 56 minutes ago.

But I have been unable to post/publish it.

I may not be able to post this, either. But maybe something very short and simple will work; where what I’ve got ready won’t.

Sorry about that! I’ve been talking with my hosting service, and may be getting the problem fixed.

-Brian H. Gill

Posted in Being a Writer, Journal | Tagged , , | Leave a comment

Two Nearby Habitable(?) Worlds; Elements for Life

Alejandro Suárez Mascareño's and Inés Bonet's (IAC) impression: GJ 1002's two Earth-mass planets.
Alejandro Suárez Mascareño’s and Inés Bonet’s (IAC) impression of GJ 1002’s two Earth-mass planets.

We’ve found two new worlds, GJ 1002 b and c, that could be habitable. They’re the right size and most likely around the right temperature.

Actually, make that three new worlds. Another one, Wolf 1069 b, showed up in my news feed as I was writing this.1 But Wolf 1069 b will wait for another time.

What with one thing and another — including an unexpected visit from a daughter, son-in-law and granddaughter — I didn’t ramble on as much as usual this week.

So I’ll take a brief, for me, look at GJ 1002 b and c. And I’ll talk about literally cool data from the JWST: a look at ingredients for “the building blocks of life” in the Chamaeleon I dark molecular cloud.


GJ 1002’s Two Maybe-Habitable Worlds

Screenshot: 'Discovery Alert: Two 'Nearby' Worlds Might be Habitable' (January 23, 2023)Studying these worlds will scientists more pieces for the ‘are we alone’ puzzle.

Discovery Alert: Two ‘Nearby’ Worlds Might be Habitable
Pat Brennan, NASA’s Exoplanet Exploration Program, NASA (January 24, 2023)
The discovery: Two planets about as massive as Earth orbit a red-dwarf star only 16 light-years away – nearby in astronomical terms. The planets, GJ 1002 b and c, lie within the star’s habitable zone, the orbital distance that could allow liquid water to form on a planet’s surface if it has the right kind of atmosphere.
Key facts: Whether red-dwarf stars are likely to host habitable worlds is a subject of scientific debate. On the minus side, these stars — smaller, cooler, but far longer-lived than stars like our Sun — tend to flare frequently in their youth. Such flares could potentially strip the atmospheres from closely orbiting planets, and the two planets orbiting GJ 1002 are close indeed….
“…On the plus side, however, GJ 1002 seems to be mature enough to have gotten over its youthful tantrums….”

Jon Lomberg's illustration: showing the Kepler spacecraft's search volume. (commissioned ca. 1990-92 by Smithsonian Institution for display in National Air and Space Museum) via Wikimedia Commons, used w/o permission.First off, GJ 1002 really is “nearby in astronomical terms.”

The red dwarf is about 16 light-years out, in the general direction of Iota Ceti. Compared to the Kepler space telescope’s search area (the yellow cone in that illustration), it’s practically next door. Most stars viewed by Kepler were between 500 and 3,000 light-years of us.

Backing off a bit, to a galactic scale, GJ 1002 is almost in our back yard.

Next, a few clarifications. Or, putting it another way, I’ve found more information about the GJ 1002 planetary system. Or indulged in nitpicking. Either way, here goes —

GJ 1002 b orbits its sun every 10 days, eight hours, 18 minutes and several seconds. GJ 1002 c’s year is 21 days, four hours, 50 minutes and many seconds long. I can see why the NASA article rounded it to 10 and 20 days.

Planet b’s mass might be 1.08 time Earth’s: give or take 0.13. Planet c is more massive, 1.36 times Earth’s mass. Give or take 0.17.

We may confirm that b has “…a mass slightly higher than Earth’s…” and that c is “…about a third more massive than Earth…” But in each case, that’s the minimum mass, based on current data.

Scientists sorted out how much GJ 1002’s planets tug their star toward and away from us during each orbit, using data from the European Southern Observatory’s ESPRESSO and CARMENES instruments.

Radial velocity measurements or Doppler spectroscopy are fancy ways of naming that method for finding exoplanets.2

There’s more I’d like to say about these newly-discovered worlds.3 But if I do that, I won’t have time to talk about cool new data — literally — from the James Webb Space Telescope.

CHONS, Methanol, CHNOPS and the Chamaeleon I Dark Molecular Cloud

NASA, ESA, CSA, and J. Olmsted (STScI)'s illustration: absorption lines from dark cloud Chamaeleon I, showing which substances are present within the molecular cloud. Spectral data from three of the James Webb Space Telescope's instruments. (2023)
Graphs of data from JWST instruments: showing evidence of frozen substances, including methanol.
NASA, ESA, CSA, et al.'s image by JWST Near-InfraRed Camera (NIRCam) of the Chameleon I dark molecular cloud's central region, 630 light years away. Protostar Ced 110 IRS 4 (orange, upper left) illuminates cold, wispy cloud material (blue, centre). Light from background stars like NIR 38 and J110621 (orange dots) can be used to detect ices in the cloud, which absorb starlight passing through them.
Chamaeleon I dark molecular cloud. Light from background star NIR 38 revealed CHONS.

Webb Unveils Dark Side of Pre-stellar Ice Chemistry
Laura Betz, NASA’s Goddard Space Flight Center, Greenbelt, Maryland; Bethany Downer, ESA/Webb Chief Science Communications Officer; Christine Pulliam, Space Telescope Science Institute, Baltimore, Maryland (January 23, 2023)
“If you want to build a habitable planet, ices are a vital ingredient because they are the main source of several key elements — namely carbon, hydrogen, oxygen, nitrogen, and sulfur (referred to here as CHONS). These elements are important ingredients in both planetary atmospheres and molecules like sugars, alcohols, and simple amino acids.
“An international team of astronomers using NASA’s James Webb Space Telescope has obtained an in-depth inventory of the deepest, coldest ices measured to date in a molecular cloud. In addition to simple ices like water, the team was able to identify frozen forms of a wide range of molecules, from carbonyl sulfide, ammonia, and methane, to the simplest complex organic molecule, methanol. (The researchers considered organic molecules to be complex when having six or more atoms.) This is the most comprehensive census to date of the icy ingredients available to make future generations of stars and planets, before they are heated during the formation of young stars….”

“If you want to build a habitable planet….” That first sentences could send me down a rabbit hole.

But terraforming Venus, Mars and maybe other worlds is — another topic. One that’s very hypothetical today: since we don’t (quite) have the technology; and, maybe more to the point, don’t have economic incentives that’d make it worthwhile.

Acronym time.

The NASA article talked about CHONS: the elements carbon, hydrogen, oxygen, nitrogen and sulfur. They’re the four most common elements in living organisms.

On Earth, at any rate. And that’s yet another topic.

Another acronym, CHNOPS, stands for carbon, hydrogen, nitrogen, oxygen, phosphorus and sulfur. The extra element, phosphorus, is vital, since it’s part of some lipids and nucleic acids.

Two nucleic acids, DNA and RNA, handle data storage and transfer in our cells. Our cell membranes include phospholipids: so without CHONS and CHNOPS, we wouldn’t live.

And, yes, CHNOPS is pronounced schnaps. Scientific jargon has gotten a great deal less stuffy since my youth. Which, granted, is my opinion and yet again another topic.

Back to that article. This data from the JWST is “the most comprehensive census to date”: which is a big deal for scientists who are figuring out how planets form.4

I’m running out of time, so here’s another excerpt:

“…’Our results provide insights into the initial, dark chemistry stage of the formation of ice on the interstellar dust grains that will grow into the centimeter-sized pebbles from which planets form in disks,’ said Melissa McClure, … principal investigator of the observing program and lead author of the paper describing this result. ‘These observations open a new window on the formation pathways for the simple and complex molecules that are needed to make the building blocks of life.
“In addition to the identified molecules, the team found evidence for molecules more complex than methanol, and, although they didn’t definitively attribute these signals to specific molecules, this proves for the first time that complex molecules form in the icy depths of molecular clouds before stars are born….”
(Laura Betz, NASA’s Goddard Space Flight Center, Greenbelt, Maryland; Bethany Downer, ESA/Webb Chief Science Communications Officer; Christine Pulliam, Space Telescope Science Institute, Baltimore, Maryland (January 23, 2023) [emphasis mine])

It’s a big jump, going from complex organic molecules to trout, daffodils and us.

But we’ve been filling in gaps in our knowledge of how clouds of interstellar gas collapse into stars, planets and — in Earth’s case — us. Quite a few of those gaps have been filled in since I started paying attention, a little over a half-century back.


God’s God, I’m Not, and I’m Okay With That

Survata's 'do you believe in extraterrestrial life' survey results. (ca. 2013)
Extraterrestrial Life: a Survata Opinion Poll. (ca. 2013)

I talked about religious beliefs, assumptions and an opinion poll a year ago; and a very unexpected opinion a few months before that:

About that opinion poll, I’d be in the “I’m not sure” segment. We’re finding ample evidence that our corner of this galaxy is stocked with life’s building blocks. But so far we’ve found no unequivocal evidence that life exists anywhere except on Earth.

And, although people who aren’t human might be living just a few dozen light-years away, we’ve found no solid evidence that we have neighbors.

So “I’m not sure” about extraterrestrial intelligence. Right now, we don’t know.

If we learn that extraterrestrial life exists: and that we have neighbors? From my viewpoint, that’s great! There’s a great deal we could learn.

Meanwhile, I sure won’t say that God either must have provided us with company or that there can’t be life anywhere except here. Either way, it’s not my decision.

“A False Choice”

'The Descent of the Modernists,' E. J. Pace. (1922)The opinion poll and op-ed — or, rather, a review of a New York Times op-ed — were mostly good news.

“…If the cultural conversation requires people to choose between their faith and science, most will choose faith, but we don’t have to ask people to choose. It is a false choice.
“At the same time, Haarsma said, there are Christians who present faith as opposed to the obvious, instead of ‘faith as a commitment lived in response’ to the evidence. She also said the passionate anti-science rhetoric of a minority of Christians online encourages scientists to reject people of faith as a whole….”
(“Reviews | How Covid raised the stakes in the war between faith and science” newsnetdaily.com (November 7, 2021))

Survata recognizing that Catholics aren’t Baptists, and that we’re both Christians, indicates at least some understanding of our beliefs.

The New York Times is still behind a paywall, so I don’t have access to the Haarsma op-ed.

But the review lets me hope that at least one Times contributor realizes that “the passionate anti-science rhetoric of a minority of Christians online” may not reflect Catholicism’s core beliefs.

It’s a step in the right direction.

And that paradigm shift may explain why it’s been months since I’ve seen “Christians believe”, followed by some reference to fundamentalist preferences in my news feeds.

Or maybe that weirdness deficit is due to AI personalization. I don’t go looking for lunacy. There’s a superabundance of the stuff oozing from headlines, as it is. It feels like there is, at any rate. Sometimes.

“…God … Does Whatever He Wills.”
NGC 4848 and other galaxies, image by Hubble/ESA.

In any case, I’ve just about run out of time this week. So I’ll wrap this up with quotes from a Saint and the Bible, followed by the usual links.

Question the beauty of the earth, question the beauty of the sea, question the beauty of the air…. They all answer you, ‘Here we are, look; we’re beautiful.’…
“…So in this way they arrived at a knowledge of the god who made things, through the things which he made.”
(Sermon 241, St. Augustine of Hippo (ca. 411) [emphasis mine])

“Indeed, before you the whole universe is like a grain from a balance,
or a drop of morning dew come down upon the earth.
“But you have mercy on all, because you can do all things;
and you overlook sins for the sake of repentance.”
(Wisdom 11:2223 [emphasis mine])

“Our God is in heaven and does whatever he wills.”
(Psalms 115:3)

Living in, and appreciating, “a grain from a balance”:


1 Another new world:

2 Details:

3 More details:

4 Elements for life:

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Organ Donations: Rolly, Options and Decisions

Prajapati family's handout: photos of Rolly. (during or before April 2022) via BBC News, used w/o permission.
Rolly: killed when she was six. Her organs helped save several lives.

It’s not a happy ending, but the situation could have been worse.

Organ donation: ‘My daughter was shot but lives on in those she saved’
Harry Low, BBC News (January 30, 2023)
“…Rolly Prajapati was sleeping peacefully last April in the home she shared with her five brothers and sisters in suburban Delhi. In the next room, her parents were preparing dinner when they heard a loud bang and a scream.
“When they went into the room, Rolly cried out for her parents before falling unconscious.
“It was only when they saw blood trickling out of her right ear that they realised something awful had happened: a stray bullet had entered the family’s home in Noida and hit her….”

Rolly’s family took her to a hospital, but her brain had stopped working. Nine months later, police say there’s “no clear suspect” but that they’re still investigating.

Meanwhile, several folks haven’t died: thanks to a decision the Prajapati family made.

“…Her father Harnarayan Prajapati explained that the decision to donate a child’s organs was not always straightforward.
“He said: ‘I didn’t know what to do. I kept thinking through the night. I told the [doctor] that we needed more time to think.
“‘Eventually we decided to go ahead, thinking ‘if my daughter’s organs could save someone’s life, then we should do it’….”
(Harry Low, BBC News (January 30, 2023))

I strongly suspect that calling the decision to donate Rolly’s organs “not always straightforward” was an understatement.

But I think Rolly’s family made a good choice. I’ll get back to that.

Knowing It’s an Option

BBC News chart: 'Deceased organ donors (per million people) 2021'. via BBC News, used w/o permission.
U.S. lead on Spain due partly to 100,000-plus deaths in opioid epidemic.

“…But bringing the idea of the lifesaving potential of donating into the minds of ordinary people was perhaps the most important factor….
“…At the forefront of this is Dr Deepak Gupta, who has travelled to Rome to meet Reg and other experts from the organ donation community.
“It was Dr Gupta who first spoke about the option of organ donation to Rolly’s parents — they, like many in the country, had never heard of it.
“He used Nicholas’s example to show Mr Prajapati, who is illiterate, the possible impact of donating.
“One person dies in India from a head injury every three minutes, according to the Lancet Neurology Commission, and so, as Dr Gupta says, there is ‘a lot of potential for donors’….”
(Harry Low, BBC News (January 30, 2023))

South Asia's Gupta Empire, Vakataka's and other holdings, ca.375 and 450 From Woudloper's maps of Gupta Empire, A. Agrawal et al., via Wikipedia, used w/o permission.Things haven’t been the same in the Noida area, ever since Skandagupta died.

Whether that’s good news, bad news, or — actually, I think reviewing events over the last three quarters of a millennium is more than I want to do today.1

Before Rolly’s death, Mr. Prajapati had known about blood transfusions. But he hadn’t heard of organ transplants. And, since he couldn’t read, hadn’t read about them either.

I’ve run across the assumption that illiterate and ignorant mean the same thing. As I see it, someone might be both illiterate and ignorant. But someone who knows how to read can choose to use the skill: or not. And that’s another topic.

The point is that a great many folks in India don’t see organ donation as an option, arguably because they don’t know it is an option.

Family traditions or religious scruples may keep some from gifting organs after death. Others may simply feel squeamish at the thought. Understandably.

But my guess is that many would decide, as Mr. Prajapati did, that it’s a good idea.

A Hard Decision

Vincent van Gogh's 'Old Man Grieving', lithograph (?) based on drawing 'Worn Out'. (1882) via Wikipedia, used w/o permission.I don’t know how Mr. Prajapati felt, when he saw blood coming from his daughter’s right ear. Or later, when he was told that her brain had shut down.

I can guess, based on how I felt when our sixth pregnancy ended with Elizabeth thrashing around on our way to a hospital.

Followed by knowledge that there was no detectable heartbeat. And me following an ambulance from our regional hospital to one down in St. Cloud. This was several decades back now, and; well — losing a child, judging from my experience, is not pleasant. At all.

In today’s context, I’d better explain why my wife and I didn’t volunteer Elizabeth’s organs for transplant.

For one thing, we were both a bit preoccupied; and the question didn’t come up.

For another, and I’d have to research this to be sure: but I’m pretty sure that organ donation wasn’t an option. Several hours had passed since Elizabeth’s death, by the time we got her and my wife disconnected.

My hat’s off to the Prajapati family, for choosing to let Rolly’s death help others.

“…A Noble and Meritorious Act….”

James Gillray's 'The Cow-Pock—or—The Wonderful Effects of the New Inoculation!' (1802) via Wikimedia Commons; used w/o permission.
Vaccination’s bovine perils: a strident warning from James Gillray. (1802)

SPL image: 'A thymus is necessary for a healthy immune system' via BBC News, used w/o permission.Medical science has come a long way since my youth: heart transplants are no longer international news, hip replacement surgery is a comparatively routine procedure, and researchers are working on grow-your-own replacement organs.2

But: is it right to for us to help folks live longer, healthier lives?

Briefly, yes. But ethics mater, just like with everything else we do.

Less briefly, medical treatments are okay. Provided that benefits outweigh risks. And that I’m not helping one person by killing or maiming another. (Catechism of the Catholic Church, 2278, 2296)

Putting it another way, healing the sick is a good idea. So is prayer. Life and physical health are precious gifts, but neither should be my top priority. Scientific research is a good idea, so are organ transplants; but ‘it’s for science’ doesn’t trump ethical standards. (Catechism, 1506-1512, 2288-2289, 2292-2296)

“Organ transplants are in conformity with the moral law if the physical and psychological dangers and risks to the donor are proportionate to the good sought for the recipient. Organ donation after death is a noble and meritorious act and is to be encouraged as a expression of generous solidarity. It is not morally acceptable if the donor or his proxy has not given explicit consent. Moreover, it is not morally admissible to bring about the disabling mutilation or death of a human being, even in order to delay the death of other persons.”
(Catechism of the Catholic Church, 2296) [emphasis mine]

Perceptions, Assumptions and “The Brain That Wouldn’t Die”

Reynold Brown's theatrical release poster for 'The Brain That Wouldn't Die'. (1962) via Wikipedia, used w/o permission.Some of this week’s good news is what I haven’t seen in the news. Granted, I didn’t go looking for something shocking.

And it’s not surprising that the BBC News article didn’t include an interview with some crackpot pastor or campus atheist, who proclaimed that organ transplants are a Satanic plot.

Or that Christians are superstitious louts who hate science and love ignorance.

For one thing, that’s not the sort of thing BBC News does.

For another, I’m pretty sure that word is getting around, that a great many American Christians aren’t trying desperately to forget that it’s not 1925 any more.

Even so, I still run across hints that films like “The Brain That Wouldn’t Die” retain their influence on public perceptions. And that’s yet another topic.

I’ve talked about transplants, medicine and bioethics before, but not recently:


1 Another ‘good old days’:

2 Medical science and technology:

Posted in Journal, Science News | Tagged , , , | Leave a comment

Pax Romana, Caligula: Fiend, Monster, or Baddie?

Ny Carlsberg Glyptotek, København's photo: A marble bust of Caligula (right) with traces of original paint and a plaster replica (left) approximating the polychrome traditions of ancient sculpture.
Caligula: marble bust (right), plaster reproduction (right), with original colors approximated.

Caligula is currently famous, or infamous, for being a stark-raving-mad monster with no redeeming qualities. Although scholars have been acknowledging that we don’t actually know much about him.

I’m not about to try rehabilitating Caligula’s image. But I’ve got suspicions about what the third Roman emperor was really like. I’ll get back to that.

But first, I’ll take a brisk slog through some of what Tacitus and Suetonius had to say about Caligula; followed by a bit about statues, art and post-Renaissance preferences.

And finally, what folks like Caligula and Nero were doing in the Pax Romana.

That’s the idea, at any rate.


Caligula: Little Boots and Rumors

Unknown photographer's photo: Part of the Ara Pacis, showing members of the Imperial household. Germanicus is the toddler (left) holding Antonia Minor's hand. (photo probably taken 20th century) uploaded to Wikimedia Commons by MM, used w/o permission.
Family portrait on the Ara Pacis. Germanicus is the toddler holding holding Antonia Minor’s hand.

Roman naming conventions were far from simple. But that’s not why we’ve been calling Rome’s third emperor “Caligula”, instead of Gaius Julius Caesar Augustus Germanicus.

Young Gaius et cetera was named, partly, after Gaius Julius Caesar.

Gaius/Caligula spent part of his childhood at the front lines, in northern Germania, with his mother and father, Agrippina the Elder and Germanicus.

Bear with me, this connects to his “Caligula” nickname; and, I think, says something about his family of origin.

His mother had Caligula wear a scaled-down version of a “common soldier’s uniform”, and encouraged the troops to call him Cæsar Caligula. “Caligula” means “little boot”. Caligae were general-issue hobnail sandal-boots for Roman soldiers.

An unknown artist's bust of Germanicus (ca. 14-19 A.D.) Found at Béziers, currently at Musée Saint-Raymond via Wikimedia Commons, used w/o permission.Germanicus — that’s a portrait bust of him, from what’s now southern France — must have had a praenomen, what I’d call his first name. But we don’t know what it was.

Germanicus was his second cognomen, or agnomen, or nickname — again, Roman names were complicated.

He became part of the Gens Julia when Tiberius adopted him.

Finally, getting back to Caligula.

Whether or not Agrippina and young Caligula being at the front lines was good news depends on who’s talking.

“…Meanwhile a rumour had spread that our army was cut off, and that a furious German host was marching on Gaul. And had not Agrippina prevented the bridge over the Rhine from being destroyed, some in their cowardice would have dared that base act. A woman of heroic spirit, she assumed during those days the duties of a general, and distributed clothes or medicine among the soldiers, as they were destitute or wounded. According to Caius Plinius, the historian of the German wars, she stood at the extremity of the bridge, and bestowed praise and thanks on the returning legions. This made a deep impression on the mind of Tiberius. ‘Such zeal,’ he thought, ‘could not be guileless; it was not against a foreign foe that she was thus courting the soldiers. Generals had nothing left them when a woman went among the companies, attended the standards, ventured on bribery, as though it showed but slight ambition to parade her son [Caligula] in a common soldier’s uniform, and wish him to be called Cæsar Caligula. Agrippina had now more power with the armies than officers, than generals. A woman had quelled a mutiny which the sovereign’s name could not check.’ All this was inflamed and aggravated by Sejanus, who, with his thorough comprehension of the character of Tiberius, sowed for a distant future hatreds which the emperor might treasure up and might exhibit when fully matured….”
(“The Annals”, Tacitus Book 1, 69 (68 A.D.) translation based on Alfred John Church and William Jackson Brodribb (1876) via Wikisource) [emphasis mine]

A few years later Germanicus got sick and died. He was only 33 years old, and involved in the usual Roman politics, including trouble with someone named Piso. Which may have sparked rumors starring Piso as a poisoner.

Rome’s emperor at the time was Tiberius, who died a bit shy of two decades later. Probably from natural causes.

But Suetonius, writing nearly a century later, said that “some think” Caligula offed Tiberius with poison, starvation, or suffocation.

“…Some think that Gaius [Caligula] gave him a slow and wasting poison; others that during convalescence from an attack of fever food was refused him when he asked for it. Some say that a pillow was thrown upon his face, when he came to and asked for a ring which had been taken from him during a fainting fit. Seneca writes that conscious of his approaching end, he took off the ring, as if to give it to someone, but held fast to it for a time; then he put it back on his finger, and clenching his left hand, lay for a long time motionless; suddenly he called for his attendants, and on receiving no response, got up; but his strength failed him and he fell dead near the couch….”
(“Lives of the Twelve Caesars”, Tiberius, 73; Suetonius, (Written during or after 120 A.D.))

At any rate, Caligula became Rome’s third emperor. And survived for not quite another four years.1


Ancient Sculptures: In Living Color

Anna-Marie Kellen/Metropolitan Museum of Art, New York's photo: galleries in the Metropolitan Museum of Art, New York, with familiar all-white ancient statuary and pieces reconstructed with close approximations to their original colors. (early 21st century)
Familiar ancient ‘cleaned’ statuary and accurate reconstructions. (Metropolitan Museum of Art, New York)

Up until a few years ago, ancient Greek and Roman statues displayed in museums were very, very white. Literally white: not the pinkish-beige skin tone some northwestern Europeans get after a long winter.

That’s not how they looked, back in the day. And, recently, some museums have started looking at ancient sculptures before putting them on display: instead of scrubbing them.

And we’re getting a more colorful look at familiar historical figures.

Analysis of a Caligula Bust

The Fitzwilliam Museum's photo: '...small, corroded bronze head has been identified as a rare surviving image of Caligula, one of only a few that escaped destruction or re-cutting after the hated Emperor’s assassination in 41 BCE....'We knew what Caligula looked like, thanks to a few of his statues and busts getting missed during the post-assassination purge.

Granted, we’re looking at official portraiture: so these bits and pieces had been metaphorically airbrushed.

But surviving Caligula sculptures each look like the same individual: what the J. Paul Getty Museum, describes as “…a young man with a high forehead, small mouth, and thin lips….”

Suetonius, who emphatically hadn’t been a Caligula fan, gave us a much juicier description:

“…He was very tall and extremely pale, with an unshapely body, but very thin neck and legs. His eyes and temples were hollow, his forehead broad and grim, his hair thin and entirely gone on the top of his head, though his body was hairy. Because of this to look upon him from a higher place as he passed by, or for any reason whatever to mention a goat, was treated as a capital offence. While his face was naturally forbidding and ugly, he purposely made it even more savage, practising all kinds of terrible and fearsome expressions before a mirror….”
(“The Lives of the Twelve Caesars”, “The Life of Caligula“, 50, C. Suetonius Tranquillus (ca. 121 A.D.) Maximilian Ihm in the Teubner edition of 1907, Loeb Classical Library (1913-1914) via Greek and Roman Authors on LacusCurtius, University of Chicago)

Since many of the few surviving Caligula sculptures had been scrubbed clean, guessing how pale or tan, blond or otherwise, Rome’s third emperor had been — was guesswork.

Happily, some ancient sculptures hadn’t been thoroughly cleaned. Like the one I put at the start of this week’s post. (From the Ny Carlsberg Glyptotek, København / New Carlsberg Glyptotek, Copenhagen.)

Folks at the Copenhagen museum worked out their Caligula bust’s original colors through visual examination, what they called technical imaging, and very careful sampling.

A resource I ran across asserted that Caligula had blue eyes. At the time I’d dismissed it as just another alternatively-accurate opinion piece. And partly because by the time I realized citing it might be interesting, I’d forgotten the URL and couldn’t re-locate it.

Maybe the author glanced at a report of the Ny Carlsberg Glyptotek work. And gotten the wrong idea about “…a strong luminescence of Egyptian blue in the right eye….”

There had been blue particles in the eye pigments: as well as in the hair and face. But they were part of complex pigment mixes.

So I figure the Ny Carlsberg Glyptotek folks got it right. Their Caligula bust had originally had brown hair and eyes and a medium-tan complexion. And so, very likely, had Caligula.2

Scrubbing Statues, Chromophobia, Beeldenstorm

Iconoclastic incident at the Cathedral of Our Lady, Antwerp; August 21, 1566. From 'Histoire de la guerre des Païs-Bas....' (1727)The good news is that the metaphorical cat is out of the bag.

Many scholars acknowledge that ancient Greece and Rome hadn’t been decorated with blank white sculptures.

The frustrating angle, for me, is that contemporary ethnic politics has been coloring some of the literature. My opinion.

But again, good news: we’re finally past the post-Renaissance obsession with whitewashing color out of European culture.

Leonardo da Vinci apparently helped scrub our perceptions of ancient sculpture.

Partly, maybe, because paint on ancient statues had mostly weathered away by the time he saw them. But Leonardo’s motives very likely also involved commercial concerns, and that’s another topic.

Like pretty much everything involving humans, it’s complicated.

Johann Joachim Winckelmann (1717-1768) apparently deserves credit our tidily scrubbed ancient statuary. He also got the ball rolling on sorting out Greek, Greco-Roman and Roman art.

His motives for promoting the purely pristine were — pure.

“…Some of the pigment was scrubbed off by restorers whose acts, while well intentioned, were tantamount to vandalism. In the 18th century, the pioneering archaeologist and art historian Johann Joachim Winckelmann chose to view the bare stone figures as pure—if you will, Platonic—forms, all the loftier for their austerity. ‘The whiter the body is, the more beautiful it is as well,’ he wrote. ‘Color contributes to beauty, but it is not beauty. Color should have a minor part in the consideration of beauty, because it is not [color] but structure that constitutes its essence.’ Against growing evidence to the contrary, Winckelmann’s view prevailed. For centuries to come, antiquarians who envisioned the statues in color were dismissed as eccentrics, and such challenges as they mounted went ignored….”
(“True Colors“, Matthew Gurewitsch, Smithsonian Magazine (July 2008))

Again, anything involving humans gets complicated: fast.

But I’ve suspected that there’s a link between so much color draining out of northern European visual culture and religious spasms like Beeldenstorm. I see it as part of a mess that’s been boiling over since around the 1500s,

And, while researching this week, I learned that I’m not the only one who’s noticed how bland my branch of civilization had become:

Chromophobia
David Batchelor (2000) via Google Books

“The central argument of Chromophobia is that a chromophobic impulse — a fear of corruption or contamination through color — lurks within much Western cultural and intellectual thought. This is apparent in the many and varied attempts to purge color, either by making it the property of some ‘foreign body’ — the oriental, the feminine, the infantile, the vulgar, or the pathological — or by relegating it to the realm of the superficial, the supplementary, the inessential, or the cosmetic.
“Chromophobia has been a cultural phenomenon since ancient Greek times; this book is concerned with forms of resistance to it….”

I haven’t read Batchelor’s book, but I’m guessing that “since ancient Greek times” refers at least partly to old-school gnosticism.3 And that’s yet another topic.


Tiberius Gracchus and Caligula: Enemies of the Status Quo

Jan Luyken's 'Emperor Caligula Attacked in a Vault by an Armed Gang'. (1704)
Caligula’s assassination, as imagined by Jan Luyken.

These days, when U.S. senators or representatives feel like they’ve had enough of a president, they form committees, have press conferences, and make speeches.

The Roman Republic had a very similar system, but an arguably more energetic one.

Take Tiberius Gracchus, for example. He was a clear and present threat to what in my youth would have been called “national security”. T. G. had been transferring ownership of land from the Roman state and wealthy Romans to the folks who were working the land.

I’m oversimplifying everything in this post something fearful, by the way.

Anyway, Tiberius Gracchus had reasons for doing what he did.

And Scipio Nasica had reasons for doing what he did: forming a posse/mob/strike force and killing Tiberius Gracchus.

So Cassius Chaerea, I’m back to Caligula’s assassination now, was following a well-established tradition in 41 A.D., when he and other members of the Praetorian Guard killed Caligula.

And you thought American politics was bad, which is yet again another topic. Almost.

Details of Caligula’s assassination/execution/whatever vary with who’s retelling the tale.

And we’ve got pretty much no documentation of what Caligula actually did during his stint as emperor. Documentation that’s not hearsay, written years, decades, or about a century after the fact, that is.4

I gather that Caligula had been a ‘threat to national security’ partly because he spent money on large-scale construction projects.

Julius Caesar, Caligula and Nero: a Possible Pattern

Chris 73's photo: the Aqua Claudia (ca. 2009) via Wikipedia, used w/o permission.
The Aqua Claudia aqueduct, one of Caligula’s construction projects.

That may be why Romans who weren’t wealthy and aristocratic liked him, at least early on.

Those big construction projects employed a great many workers. I see that as a good thing, partly because the ancient Roman economy wasn’t all that much unlike ours.

Folks working on construction projects got paid. And, with pay coming from their employment, those non-upper-crust Romans were less dependent on their betters.

In a way, it’s a wonder Caligula lasted as long as he did.

Maybe he really did go crazy after a few years in office.

Or maybe the overwhelming anti-Caligula sentiment was the result of effective public relations campaigns, bankrolled by Roman bigwigs who were inspired by patriotism, self-interest, or some combination of motives.

On the other hand, maybe Rome’s blue-collar set figured that the powers that be were exercising their traditional rights. And that they might go after suspected Caligula sympathizers next.

I could be wrong about this, but I see a pattern in the leadership and deaths of Julius Caesar, Caligula and Nero.

In each case, we’re looking at someone we could call a populist. And who, once in office, acted as if non-upper-crust folks mattered.

Again in each case, Rome’s top official actively changed rules and policies that had defended the rich and powerful from the poor and weak.

Julius Caesar, Caligula and Nero each died violently.

Nero’s death was, we’re told, a suicide.

It’s a plausible explanation for his abrupt death in 68 A.D. — the Roman Senate had declared him a public enemy. But historical records describing Nero’s death and term as emperor were written after his day. And many were, at best, imaginatively lurid.5

Good Intentions: Julius Caesar and Caligula

Jean-Léon Gérôme's 'The Death of Caesar', in the Theatre of Pompey, as imagined by Jean-Léon Gérôme. (ca. 1859-1867) via Wikipedia, used w/o permission.The Roman patriots who killed Julius Caesar very likely thought they had saved the Roman Republic from a would-be king.

And they succeeded, sort of.

After Julius Caesar, a triumvirate ruled the Roman Republic. Then the Second Triumvirate split the Republic’s administrative functions, and territory, three ways.

That more or less directly led to what I still think should be called the Last War of the Roman Republic. But nowadays, I gather we’re supposed to call it the War of Actium. Sounds nicer, I suppose.

Nero’s death, assuming it was an assassination/execution, might have had similarly noble motives: or not.

Caligula’s death, again, is thoroughly but not reliably documented.

It could have been payback for Caligula’s alleged insults aimed at the chief assassin.

But Caligula had pretty much ignored the Principate, which made the emperor “first amongst the senators” / “first amongst the citizens”: on paper.

In practical terms, under the Principate the emperor was number one and everyone else a distant second. But the Senate could still pretend they were running things.

Ignoring the Principate may have been the last straw for Senators who had been getting increasingly anxious about their status and personal finances. Or who earnestly sought a return to the glorious Roman Republic.

Either way: Caligula died, Claudius became the next Emperor, and after that came Nero.6


Pax Romana: A Durable Dream

Joseph Turner's 'Caligula's Palace and Bridge' (1831) via Wikimedia Commons, in public domain except in Tate Britain, this low-rez copy used w/o permission.
‘Caligula’s Palace and Bridge’, as imagined by Joseph Turner. (1831)

Eduardo Barrón's sculpture: 'Nero and Seneca' from Eduardo Barrón/Museo de Zamora (E.Barrón: 1858-1911) via Wikipedia, used w/o permission.And that brings me to the Pax Romana, Caligula and Nero.

I still haven’t learned when Seneca the Younger’s “Romanae pacis” became “Pax Romana”, or “Roman Peace”.

Seneca’s phrase came from a ‘how to be an emperor’ book he wrote for Nero. I talked about that, Augustus, the Principate, and the Senate last year. (October 29, 2022)

I might write off “Pax Romana” as first-century political propaganda.

But I won’t, partly because Philo wrote that a great many folks in the Roman Empire saw the first part of Caligula’s term in office as a golden age. Or, more literally, “age of Saturn”.

Philo was a Hellenistic Jewish philosopher who was and still is controversial.7 But I don’t see him as a Palatine Hill insider, or political wannabe flattering whoever’s in charge.

It’s late Friday afternoon, so I don’t have time to summarize the Philo files.

Instead, I’ll quote from his “On the Embassy to Gaius”, which may have been written within months of Caligula’s murder/assassination/death. Philo, by the way, refers to Caligula by the emperor’s name, Gaius.

This edited-down excerpt — ancient authors seemed chatty, even by my standards — at least hints at what went wrong with Caligula.

“…For who-when he saw Gaius [Caligula], after the death of Tiberius Caesar, assuming the sovereignty of the whole world in a condition free from all sedition, and regulated by and obedient to admirable laws, and adapted to unanimity and harmony in all its parts, east and west, south and north; the barbarian nations being in harmony with the Greeks, and the Greeks with the barbarians, and the soldiers with the body of private citizens, and the citizens with the military; so that they all partook of and enjoyed one common universal peace-could fail to marvel at and be amazed at his extraordinary and unspeakable good fortune, since he had thus succeeded to a ready-made inheritance of all good things, … For as they had never yet all together admired any emperor who had ever existed at that time, not expecting to have in future the possession, and use, and enjoyment of all private and public good things, but thinking that they actually had them already as a sort of superfluity of prosperity which happiness was waiting to fill to the brim: … On this occasion the rich were not better off than the poor, nor the men of high rank than the lowly, nor the creditors than the debtors, nor the masters than the slaves, since the occasion gave equal privileges and communities to all men, so that the age of Saturn, which is so celebrated by the poets was no longer looked upon as a fiction and a fable, {2}{the golden age was said to have existed during the reign of Saturn upon earth. So Tibullus and Virgil.} on account of the universal prosperity and happiness which reigned every where, and the absence of all grief and fear, and the daily and nightly exhibitions of joy and festivity throughout every house and throughout the whole people, which lasted continually without any interruption during the first seven months of his reign. But in the eighth month a severe disease attacked Gaius who had changed the manner of his living which was a little while before, while Tiberius was alive, very simple and on that account more wholesome than one of great sumptuousness and luxury; for he began to indulge in abundance of strong wine and eating of rich dishes, and in the abundant license of insatiable desires and great insolence, and in the unseasonable use of hot baths, and emetics, and then again in winebibbing and drunkenness, and returning gluttony, and in lust after boys and women, and in everything else which tends to destroy both soul and body, and all the bonds which unite and strengthen the two; for the rewards of temperance are health and strength, and the wages of intemperance are weakness and disease which bring a man near to death.
“Accordingly, when the news was spread abroad that he was sick while the weather was still suitable for navigation (for it was the beginning of the autumn, which is the last season during which nautical men can safely take voyages, and during which in consequence they all return from the foreign marts in every quarter to their own native ports and harbours of refuge, especially all who exercise a prudent care not to be compelled to pass the winter in a foreign country); they, forsaking their former life of delicateness and luxury, now wore mournful faces, and every house and every city became full of depression and melancholy, their grief being now equal to and counterbalancing the joy which they experienced a short time before. For every portion of the habitable world was diseased in his sickness, feeling affected with a more terrible disease than that which was oppressing Gaius; for his sickness was that of the body alone, but the universal malady which was oppressing all men every where was one which attacked the vigour of their souls, their peace, their hopes, their participation in and enjoyment of all good things; for men began to remember how numerous and how great are the evils which spring from anarchy, famine, and war, and the destruction of trees, and devastations, and deprivation of lands, and plundering of money, and the intolerable fear of slavery and death, which no one can relieve, all which evils appeared to admit of but one remedy, namely the recovery of Gaius. Accordingly when his disease began to abate, in a very short time even the men who were living on the very confines of the empire heard of it and rejoiced, for nothing is swifter than report….”
(“On the Embassy to Gaius“, II, III; Philo (maybe as early as 41 A.D.) translated by Charles Duke Yonge)

I don’t think that life in the Roman Empire was quite as blissfully ideal as Philo outlines.

But what I do know about the era — comparatively uniform laws, well-trafficked and patrolled roads, a degree of prosperity among non-aristocrats that apparently inspired near-panic in the upper crust — strongly suggests that living inside the Roman Empire was a great deal better than alternatives.

Whoosh. That was a long sentence. Moving along.

“…The Rivalries Between Leading Men and the Rapacity of the Officials….”

Henryk Siemiradzki's 'Nero's Torches.' (1876) From Henryk Siemiradzki, via The National Museum in Kraków Digital Collection and Wikipedia, used w/o permission.Even Tacitus, who was apparently no fan of either Caligula or Augustus, shows why folks might reasonably prefer life in Imperial Rome to the Republic’s “violence, intrigue, and … corruption.”

“…Augustus won over the soldiers with gifts, the populace with cheap corn, and all men with the sweets of repose, and so grew greater by degrees, while he concentrated in himself the functions of the Senate, the magistrates, and the laws. He was wholly unopposed, for the boldest spirits had fallen in battle, or in the proscription, while the remaining nobles, the readier they were to be slaves, were raised the higher by wealth and promotion, so that, aggrandised by revolution, they preferred the safety of the present to the dangerous past. Nor did the provinces dislike that condition of affairs, for they distrusted the government of the Senate and the people, because of the rivalries between the leading men and the rapacity of the officials, while the protection of the laws was unavailing, as they were continually deranged by violence, intrigue, and finally by corruption.…”
(“The Annals”, Book 1 (2); Tacitus (68 A.D.) translation based on Alfred John Church and William Jackson Brodribb (1876)) [emphasis mine]

A Slogan, Stories and Hope

Cesare Maccari's 'Cicerone denuncia Catilina' 'Cicero Denounces Catiline.' (1889)
Cesare Maccari’s “Cicero Denounces Catiline” — a 19th century view of Roman grandeur. (1889)

If Romanae pacis/Pax Romana had been a first-century slogan, like America’s “chicken in every pot” and “better dead than red” — or the other way around, depending on viewpoint — I might not be spending so much time with the phrase.

But academics are, the last I checked, still debating when the Pax Romana began and ended. My preference is from Augustus to the death of Marcus Aurelius. Commodus — that’s a can of worms I’ll leave for another time.

Thomas Cole's 'The Consummation of Empire.' (1836) From Thomas Cole's Thomas Cole's 'The Course of Empire' series, via New York Historical Society and Wikimedia Commons, used w/o permission.And Pax Romana, either as a slogan or as an idea, has been a top-drawer cultural item, ever since the Roman Empire transitioned from current events to nostalgic memory.

Starting at least with Charlemagne, European warlords with regional ambitions claimed that they were restoring Roman imperial values and stability.

I strongly suspect that invoking memories of the Roman Empire worked because a fair number of folks had grown up with stories of Imperial days.

And that many hoped for a day when — as in days of old — commerce flowed along the Roman roads, Roman law brought a measure of security, and the aqueducts worked.8

Aristocratic Angst and Provincial Appeal

Thomas Cole's 'Aqueduct Near Rome.' (1832) fFrom Middlebury College Museum of Art, via Wikipedia, used w/o permission.
Thomas Cole’s ‘Aqueduct Near Rome.’ (1832)

Then there were Roman-era ruins, structures which even after centuries of neglect dwarfed anything built more recently.

Those might inspire hopes that Roman peace, prosperity and technology could be restored. Or at least serve as a symbol for what the current champion of Roman values promised.

Even stories about dubiously-sane emperors like Caligula and Nero haven’t out-shone memories of the Pax Romana. Or would that be out-shouted? Never mind.

I don’t think Caligula, Nero or even Augustus were paragons of virtue.

But I’m not at all convinced that Caligula and Nero were quite as monstrous as my culture’s folklore makes them.

And I suspect that surviving records say at least as much about the fears of old-school aristocrats, as they do about the allegedly-deranged duo.

Looks like I’m not the only one:

“…In many respects, the complaints of Roman sources against the Julio-Claudians ring hollow. Effective administrators such as Tiberius and Claudius appear to have been disliked primarily because they made the aristocracy pay its fair share of taxes and because they treated the lower orders of Roman society with greater equity. Even the least effective emperors, Caligula and Nero, were wildly popular with the Roman people and the provincials. This suggests that the Roman aristocracy alone suffered as a direct result of its close proximity to the seat of power. The further removed one was from the power struggles of the imperial dynasty, the better life became. This development stands in the inverse proportion to that of the Late Republic. One could even argue that the Roman aristocracy was merely receiving its just dessert after years of abuse and the misuse of power.…”
(Classics 280: Alexander the Great and the Hellenistic World, Classical World Civilizations, Chapter 18: The Pax Romana: Life in the Roman Empire; Chris Rowan, maintained by Nick Rauh) [emphasis mine]

And now I’ve run out of time this week. My next Golden Ages post will still be about the Pax Romana, but from another angle. That’s giving a lot of attention to one era. But I think those two centuries of comparative good times are worth it.

In case you haven’t had enough of my writing, here’s the usual more-or-less-related stuff:


1 Folks from first century Rome:

2 Art and color:

3 More color and culture:

4 Caligula in context:

5 Remembering Rome:

6 Rome, becoming an Empire:

7 First century Rome, viewpoints:

8 Rome, reviewed and remembered:

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