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Channon Visscher

@cvisscher.bsky.social
327 followers 254 following 69 posts

Professor of Chemistry & Planetary Sciences at Dordt University (IA) and Research Scientist with the Space Science Institute (CO) Github: cvisscher.github.io

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Reposted by Channon Visscher
Jonathan Fortney @jjfplanet.bsky.social · 18/09/2026
*8* postdoctoral positions in atmospheric physics, from the Earth to Exoplanets: aas.org/jobregister/... This is part of the Multiscale Physics of Clouds Across Planetary Atmospheres collaboration, funded by the Simons Foundation, led by Prof. @astrocaroline.bsky.social!
aas.org
Postdoctoral Researchers — Multiscale Physics of Clouds Across Planetary Atmospheres | American Astronomical Society
The Multiscale Physics of Clouds Across Planetary Atmospheres collaboration, funded by the Simons Foundation, is seeking 8 postdoctoral researchers to develop new approaches to understanding clouds ac...
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the babahuck @tylerhuckabee.bsky.social · 16/09/2026
rip annie dillard
One of the things I know about writing is this: spend it all, shoot it, play it, lose it, all, right away, every time. Do not hoard what seems good for a later place in the book or for another book; give it, give it all, give it now. The impulse to save something good for a better place later is the signal to spend it now. Something more will arise for later, something better. These things fill from behind, from beneath, like well water. Similarly, the impulse to keep to yourself what you have learned is not only shameful, it is destructive. Anything you do not give freely and abundantly becomes lost to you. You open your safe and find ashes.
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Dr. Caprice Phillips @capricephillips.bsky.social · 26/08/2026
My stellar abundance paper is finally published! iopscience.iop.org/article/10.3...
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David_j_roth @davidjroth.bsky.social · 31/07/2026
Got a good job down at the Data Center. I work on the line, and it's hard work but it's honest and the wage is fair; my family and I are grateful for it. I rivet the word "absolutely" onto the little apologies that chatbots do when they misunderstand a prompt.
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Evert Nasedkin @evertnasedkin.bsky.social · 30/07/2026
🔭 New paper day! 🪐 This time from Merle Schrader, a PhD student in the brown dwarf group at Trinity College Dublin. Today, they're publishing a fresh look at SIMP-0136, using principal component analysis, identifying the mechanisms driving its atmospheric variability. arxiv.org/abs/2607.26182
arxiv.org
The JWST weather report: Unravelling the atmospheric variability of isolated worlds using principal component analysis
Brown dwarf variability directly probes atmospheric dynamics beyond the Solar System, and recent JWST time-resolved spectroscopy has opened a new window into these processes. Principal component analy...
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Channon Visscher @cvisscher.bsky.social · 15/07/2026
Modest Mouse
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Jeremy Yoder says no war @jbyoder.org · 13/07/2026
Holy COW. Text analysis of comments on the OMB rule: overwhelming opposition, overwhelmingly not form letters. (But 9 in 10 comments supporting the rule ARE form responses, LOL) Whatever happens next, folks have stepped up.
Screenshot text: Between May 29 and July 9, roughly 51,000 comments were posted to regulations.gov (and over 200,000 more had been received but not yet published). The verdict on public sentiment is clear and lopsided: about 94 percent oppose the proposed rule and only 6 percent support it, with fewer than one percent marked as unclear. The opposition is overwhelmingly grassroots rather than orchestrated. Form letters make up only about 16 percent of all comments (roughly 8,400 comments across 210 distinct campaigns), and only about one in eight opposing comments came from a form-letter campaign. Support for the rule, by contrast, was almost entirely organized: nearly nine in ten supportive comments (about 2,500) came from a single form-letter campaign. Opponents mostly wrote their own comments; supporters mostly signed the same form-letter.
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Channon Visscher @cvisscher.bsky.social · 01/07/2026
The Federal OMB has proposed a sweeping set of rule changes for research grants: *changes that would be harmful to scientific research* If you'd like to speak out, they are still accepting comments on the proposed changes until July 13: www.federalregister.gov/documents/20...
federalregister.gov
Regulation for Federal Financial Assistance
The Office of Management and Budget (OMB) proposes to revise the Guidance for Federal Financial Assistance to improve government- wide policies and requirements related to the management of grants, co...
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Alex von Tunzelmann @alexvont.bsky.social · 08/06/2026
This is exactly it. The work is the point.
When I assign analysis, I am not trying to extract a polished product; I am trying to put the student’s mind through resistance in order to make it stronger. Offloading the struggle to a chatbot does not “free students up for higher-order work.” It deprives them of building the strength to do any substantial cognitive work at all.
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Channon Visscher @cvisscher.bsky.social · 30/04/2026
I don’t have strong feelings about it but personally prefer a geophysical definition of a planet, which would include Pluto But I do think that if a reporter asks about Pluto, you should immediately mention how NASA funding & our ability to study interesting objects like Pluto is under dire threat
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Nature @nature.com · 24/04/2026
A model of the early Solar System that cools too quickly to reach chemical equilibrium generates mineral regimes resembling important classes of meteorites go.nature.com/4sPuG7t
go.nature.com
Rapid cooling shaped the formation of the first meteorites in the Solar System
A model of the early Solar System that cools too quickly to reach chemical equilibrium generates mineral regimes resembling important classes of meteorites.
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Emily J @emexastris.bsky.social · 11/04/2026
If you’ve been moved & inspired by Artemis, NASA needs your help. Literally during A2, the president proposed cutting NASA science 47%, canceling 54 missions, including many already in-flight. To help stop these cuts, check out @planetarysociety.bsky.social www.planetary.org/save-nasa-sc...
planetary.org
Save NASA Science Action Hub
Updates and actions on the proposed cuts to NASA science in FY 2027.
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Casey Dreier @caseydreier.bsky.social · 09/04/2026
The FY 2027 NASA budget request hides its science cuts by omitting mission names instead of explicitly zeroing them out. We did the work and found 54 missions cancelled in this proposal. This is another extinction-level event for NASA science. Full list: planetary.org/save-nasa-science
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Simeon Schmauß @stim3on.bsky.social · 08/04/2026
This is possibly the most incredible tracking video of a rocket launch that I have ever seen, and Shuttle had some really incredible videos too! Just look at those gorgeous flame dynamics and then the booster separation... 🔭🧪 #Artemis
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Brian LaMarre @blamarre.bsky.social · 02/04/2026
Awesome view of @NASAArtemis II, as viewed from NOAA weather satellite. Note the dark (warmer) dot launching off from Cape Canaveral and off to the northeast! #flwx #artemis
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lastpositivist.bsky.social @lastpositivist.bsky.social · 16/03/2026
Genuinely just bonkers to watch the USA do this to one of the most successful and innovative hubs of scientific research the world has ever seen. All those years of Free Speech On Campus debates and it turns out they actually wanted less cancer research. Absurd.
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Paul Byrne @theplanetaryguy.com · 12/03/2026
This is the entire budget of NASA's Planetary Science Division for *four years*
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Joey Politano🏳️‍🌈 @josephpolitano.bsky.social · 05/03/2026
Americans: we live in a fallen state—embroiled by sin, cheating, lying, and evil. You cannot trust anyone, not even those who claim to know you best Canadians: I love my neighbors and my friends!
A picture of PEW poll on global attitude survey, saying the % who rate the morality and ethics of people in their country as good vs bad, where the US has the worst rankings and Canada the best
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Michael Plummer @magmaskies.bsky.social · 27/02/2026
Publication day for our paper on the T2.5 brown dwarf/exoplanet analog SIMP0136! We find cloud formation appears to drive upper atmospheric temperature and chemical structure. We also debut a new, novel method for vertical mapping extrasolar atmospheric dynamics. iopscience.iop.org/article/10.3...
iopscience.iop.org
Mapping the Cloud-driven Atmospheric Dynamics and Chemistry of an Isolated Exoplanet Analog with Harmonic Signatures
Mapping the Cloud-driven Atmospheric Dynamics and Chemistry of an Isolated Exoplanet Analog with Harmonic Signatures, Plummer, Michael K., Cocchini, Francis P., Kearns, Peter A., McCarthy, Allison M., Artigau, Étienne, Cowan, Nicolas B., Akhmetshyn, Roman, Vos, Johanna M., Nasedkin, Evert, Visscher, Channon, Benneke, Björn, Doyon, René, Metchev, Stanimir A., Rowe, Jason F., Suárez, Genaro
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Joel Boerckel @jboerckel.bsky.social · 05/02/2026
I present the most interesting graph ever made. HUMAN ON BICYCLE beats every other living thing. www.scientificamerican.com/article/a-hu...
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Cato Institute @cato.org · 03/02/2026
The US immigrant population generated more in taxes than they received in benefits from all levels of government every year from 1994 to 2023. The Cato study provides the first-ever 30-year analysis of the fiscal effects of immigration on government budgets. ow.ly/jy8a50Y8kM3
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Mark Marley @markmarley.bsky.social · 17/01/2026
Great article on the cosmic shoreline. I was fortunate to have an office near Kevin’s for my 20 years at NASA Ames. He is the most creative planetary scientist I know.
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Brooke Harrington @ebharrington.bsky.social · 31/12/2025
They're going to *throw out* one-of-a-kind NASA archives?! Not even a year since the Inauguration & we're already at the 2nd-time-as-farce version of the burning of the Library of Alexandria.
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Brian Hughes @bmhughes.bsky.social · 01/12/2025
This is actually quite brilliant, up to and including the final sentence 🔥
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Channon Visscher @cvisscher.bsky.social · 12/11/2025
we had spent much of the (chilly) evening in the countryside away from any lights, but my favorite image of the night ended up being the aurora just casually, majestically, filling the sky above our homes
Image of the front entrance of a house, showing bright northern lights above: a green layer of aurora beneath a red aurora
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Channon Visscher @cvisscher.bsky.social · 21/10/2025
Teaching some comparative planetology, it turns out that lighting half-buried firecrackers in a bed of sand does a pretty nice job of simulating the formation of impact craters ; ) 🧪🔭
Still image of sand bed with firecracker explosion starting to spread out an ejecta blanket
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Channon Visscher @cvisscher.bsky.social · 13/10/2025
nist.gov and its associated subdomains: incredibly useful and important data, at risk of being lost...
nist.gov
National Institute of Standards and Technology
NIST promotes U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that enhance economic security and improve our quality of life
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Channon Visscher @cvisscher.bsky.social · 25/09/2025
I think about this plot all the time, and especially with respect to things like autism. If you’d lived in 1940 and had access to this data, would it feel like an “epidemic” of left-handedness?
Classic plot of the occurrence of left handedness by birth year. The plot starts at 5% in 1890, dips to near 3-4% around 1910 then rises until leveling off at 12% in 1960 onward
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Channon Visscher @cvisscher.bsky.social · 18/09/2025
The Summer I Misplaced the Moon... #TSITP 🔭 Watching the finale last night I happened to notice a few oddities regarding the placement of the Moon, so I wrote a quick set of review slides to work through with my intro astro class ; ) (other than times/locations, this should be spoiler free)
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Channon Visscher @cvisscher.bsky.social · 16/09/2025
The two kinds of overleaf authors 🧪
Screenshot comparing two snippets of the overleaf recompile pane. One shows a document with 56 errors, the other shows a document with 2 warnings.
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Channon Visscher @cvisscher.bsky.social · 10/09/2025
Our (Faherty et al) newly published JWST detection of silane (SiH4) in the brown dwarf W1534 (aka "The Accident")! This molecule isn't seen on Jupiter because it's removed by deep silicate clouds, but unusual chemical properties of W1534 allow SiH4 to be mixed up into the visible atmosphere 🔭 🧪
jpl.nasa.gov
NASA Study: Celestial ‘Accident’ Sheds Light on Jupiter, Saturn Riddle
An unusual cosmic object is helping scientists better understand the chemistry hidden deep in Jupiter and Saturn’s atmospheres — and potentially those of exoplanets.
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Aatish Bhatia @aatishb.com · 09/09/2025
I wrote about how Earth's wobble causes our view of the skies to shift over time. Here's a paywall-free gift link. With @fparis.bsky.social and @iamrumz.bsky.social
nytimes.com
Your Zodiac Sign Is 2,000 Years Out of Date (Gift Article)
Over millennia, our view of the stars has shifted, because of Earth’s wobble. It may be time to rethink your sign.
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Joe Lanman @joelanman.com · 26/08/2025
Avery Edison
@aedison
I wrote “I am alive” on a piece of paper, and placed it into a photocopier. What I saw next has shocking implications
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Q. Pheevr @q.pheevr.ca · 19/08/2025
The heartbreaking thing about this is that there’s already a proven way to invest lots of money in a knowledge machine that produces unforeseeable results that include fantastically profitable ideas (and some life-saving ones) and generally benefit society and this machine is called a university
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Steve Desch @deschscoveries.bsky.social · 08/08/2025
I have a complaint about Avi Loeb's latest work and I want to speak to management. medium.com/@steve.desch...
medium.com
This is not the quality of pseudoscience infotainment to which I have grown accustomed
Teasing the public with fraudulent or self-deluded promises of aliens used to mean something. It took work. It meant slapping together…
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Channon Visscher @cvisscher.bsky.social · 29/07/2025
We had an over 99mph(!) derecho pass through last night and lost a few of our favorite small trees. Thankfully house is fine we are all safe & sound!
Picture of two downed trees, a sumac and maple, in a backyard.
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Mark Marley @markmarley.bsky.social · 18/07/2025
I liked Caroline Morley's Exoclimes poster describing our Sonora model set so much that I'm going to hang up a replica in my office.
Image of a poster describing the different Sonora models, including Bobcat, Diamondback, Elf Owl, Flame Skimmer, and Gila monster.
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The Royal Society @royalsociety.org · 14/07/2025
10 years ago, #OnThisDay in 2015, NASA's New Horizons probe performed the first flyby of dwarf planet Pluto, completing the initial survey of the Solar System. This 'true colour' photo was taken on 14 July 2015, showing numerous impact craters and the large basin of the Sputnik Planitia.
A true colour close up image of the dwarf planet Pluto, showing a large dark region to the bottom left and a pale smooth region crossing the equator in the middle right. Taken by NASA's New Horizons probe in 2015.
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Harmit Singh Malik @harmitmalik.bsky.social · 25/06/2025
The current administration has more successfully destroyed US science and the scientific enterprise than the hypothetical nuclear weapons program in Iran.
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Anna Bower @annabower.bsky.social · 23/06/2025
I rarely post personal things. But I need to talk about my 4-year-old niece, Hope. She has a rare disease. A drug called elamipretide has helped her survive. But the FDA recently denied its approval. Now, her health hangs in the balance. Please share her story & urge the FDA to reconsider. 🧵
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Channon Visscher @cvisscher.bsky.social · 23/06/2025
I think about this quote at least once week, from @laurarbnsn.bsky.social
Screenshot of tweet saying "You cannot build a movement on hierarchy, conformity, dualism, and intellectual rigidity, and then expect that movement to develop a creative class. You have already killed it in the cradle. The creatives are either gone or no longer creative before contributing."
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Channon Visscher @cvisscher.bsky.social · 20/05/2025
A nice series of snapshots celebrating the 50th anniversary of the McDonnell Center for the Space Sciences at WashU in St. Louis
artsci.washu.edu
McDonnell Center for the Space Sciences celebrates 50 years of science and exploration
A half-century ago, aviation pioneer and former WashU board chair James S. McDonnell announced a $4 million gift (worth nearly $26 million today) to create the McDonnell Center for the Space Sciences ...
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Kevin M. Kruse @kevinmkruse.bsky.social · 10/05/2025
“She’s not yours to pity. She’s mine to marvel at.” www.mcsweeneys.net/articles/an-...
mcsweeneys.net
An Open Letter to Robert F. Kennedy Jr., Who Thinks My Daughter Is a Tragedy
Dear Mr. RFK Jr., (The “dear” is tradition. Don’t mistake it for affection.) You said autistic children are a burden. That they ruin families. That...
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Mark Marley @markmarley.bsky.social · 08/05/2025
The reason we do atmospheric modeling is to learn about processes. We found our Elf Owl models didn't predict the CO2 abundance in brown dwarfs correctly. This was a win, we learned something new! IOur new arXiv note explains it all and how we fixed it. Thanks Nick Wogan! arxiv.org/abs/2505.03994
arxiv.org
The Sonora Substellar Atmosphere Models. V: A Correction to the Disequilibrium Abundance of CO$_2$ for Sonora Elf Owl
To aid the interpretation of observations of substellar atmospheres, Mukherjee et al. (2024) created the Sonora Elf Owl grid of model atmospheres, simulations that accounted for disequilibrium quench ...
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Katharine Hayhoe @katharinehayhoe.com · 01/05/2025
Scientists who study climate don't automatically attribute all changes to human activity. Rather, we carefully investigate every possible natural factor that could explain the planet's warming. Could these be the real culprits? The evidence is in--and the answer is NO. This thread explains! 🧵
A graphic with an icon of the sun, a wiggly line denoting natural cycles, and a volcano, with a title reading "WHY is climate changing?" created by me. Not fancy, as my graphic design skills lean to function over art!
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Hamilton Nolan @hamiltonnolan.bsky.social · 09/04/2025
okay now that you all have gotten a taste of America's rational and predictable new trade policy, everyone who wants to build your new factories here just form an orderly line
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ESA Operations @operations.esa.int · 27/03/2025
Today we say goodbye to ESA’s Milky Way-mapper Gaia! The Gaia spacecraft has completed its sky-scanning and will be switched off this morning.
Gaia spacecraft in space in front of the Milky Way galaxy
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Alejandro Soto @soto.space · 25/03/2025
This cut is so short-sighted, as highlighted by this NIST blog post from just 5 days ago. www.nist.gov/blogs/taking... 🧪
nist.gov
Shedding Light: How NIST’s Light Database Helps Bring You Computer Chips, Welded Steel and More
Atomic spectroscopy helps to bring us many things we use every day, but without updated information, it would be harder for scientists and experts to create these things. That’s where a NIST atomic sp...
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Yvette Cendes @whereisyvette.bsky.social · 16/03/2025
Pet peeve: I hate how often ppl claim “all the researchers will just move to Europe/Canada!” You vastly under-estimate how little money there is there vs the USA- and unless that changes ASAP this loss is just going to decimate global science, full stop. 🧪🔭
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Allie McCarthy @alliemccarthy.bsky.social · 03/03/2025
Check out the press release for our recent work using JWST observations of SIMP0136! Also published today on ApJL: iopscience.iop.org/article/10.3...
iopscience.iop.org
The JWST Weather Report from the Isolated Exoplanet Analog SIMP 0136+0933: Pressure-dependent Variability Driven by Multiple Mechanisms - IOPscienceSearchopens in new tab
The JWST Weather Report from the Isolated Exoplanet Analog SIMP 0136+0933: Pressure-dependent Variability Driven by Multiple Mechanisms, McCarthy, Allison M., Vos, Johanna M., Muirhead, Philip S., Bil...
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