Mark Marley
@markmarley.bsky.social
Personal account. Substellar science since the 80s.
Reposted by Mark Marley
What if Earth-sized HZ worlds don’t have exactly Earth-like climate feedbacks? Climate Chaos, Snowballs, run-aways - but also many temperate yet not-Earth-like worlds! Congrats to Chaucer Langbert on this cool study!
arxiv.org/abs/2602.10369 @uarizonalpl.bsky.social @stewardobservatory.bsky.social
arxiv.org/abs/2602.10369 @uarizonalpl.bsky.social @stewardobservatory.bsky.social
Not Earth-like Yet Temperate? More Generic Climate Feedback Configurations Still Allow Temperate Climates in Habitable Zone Exo-Earth Candidates
Earth's climate is influenced by over a dozen feedbacks, but only three dominate its long-term climate behavior. Models of the exoplanet habitable zone (HZ) assume that this is similar for other Earth...
arxiv.org
February 13, 2026 at 1:25 AM
What if Earth-sized HZ worlds don’t have exactly Earth-like climate feedbacks? Climate Chaos, Snowballs, run-aways - but also many temperate yet not-Earth-like worlds! Congrats to Chaucer Langbert on this cool study!
arxiv.org/abs/2602.10369 @uarizonalpl.bsky.social @stewardobservatory.bsky.social
arxiv.org/abs/2602.10369 @uarizonalpl.bsky.social @stewardobservatory.bsky.social
Reposted by Mark Marley
As I say here, there is no scientific justification to revoke the engagement finding. In fact, over the last 15+ yrs, the evidence of how climate change affects our health has only grown. Higher risk of allergies, dementia, fertility, heart disease, and death: that’s what’s on the line. @nature.org
There is No Scientific Justification to Revoke the Endangerment Finding
The U.S. EPA's decision to repeal the Endangerment Finding will limit the government's ability to regulate emissions of carbon dioxide and other greenhouse gases under the Clean Air Act.
www.nature.org
February 12, 2026 at 9:45 PM
As I say here, there is no scientific justification to revoke the engagement finding. In fact, over the last 15+ yrs, the evidence of how climate change affects our health has only grown. Higher risk of allergies, dementia, fertility, heart disease, and death: that’s what’s on the line. @nature.org
Reposted by Mark Marley
Astronomers: highly recommend this thoughtful opinion piece by @hogg.bsky.social on how to think about our field in light of the development of large language models. whether you agree with him or not it’s vital to discuss the principles behind our science. 🔭 arxiv.org/abs/2602.10181
Why do we do astrophysics?
At time of writing, large language models (LLMs) are beginning to obtain the ability to design, execute, write up, and referee scientific projects on the data-science side of astrophysics. What implic...
arxiv.org
February 12, 2026 at 2:00 PM
Astronomers: highly recommend this thoughtful opinion piece by @hogg.bsky.social on how to think about our field in light of the development of large language models. whether you agree with him or not it’s vital to discuss the principles behind our science. 🔭 arxiv.org/abs/2602.10181
Glad we have the scratching post available.
February 12, 2026 at 4:34 AM
Glad we have the scratching post available.
A little javelina chaos.
February 11, 2026 at 2:13 AM
A little javelina chaos.
Reposted by Mark Marley
Galaxy Slam! Meet Marcia Rieke, Regents Professor of Astronomy at the University of Arizona’s Steward Observatory. As principal investigator for NIRCam on NASA’s James Webb Space Telescope, she helps reveal the universe’s earliest galaxies using infrared light. www.youtube.com/watch?v=fhxf...
February 4, 2026 at 7:13 PM
Galaxy Slam! Meet Marcia Rieke, Regents Professor of Astronomy at the University of Arizona’s Steward Observatory. As principal investigator for NIRCam on NASA’s James Webb Space Telescope, she helps reveal the universe’s earliest galaxies using infrared light. www.youtube.com/watch?v=fhxf...
"Astrophysicists" should have read more of the planetary literature.... We did "agnostic" ice giant models back in the 90s. ui.adsabs.harvard.edu/abs/1995JGR....
Nevertheless interesting work.
Nevertheless interesting work.
February 10, 2026 at 8:27 PM
"Astrophysicists" should have read more of the planetary literature.... We did "agnostic" ice giant models back in the 90s. ui.adsabs.harvard.edu/abs/1995JGR....
Nevertheless interesting work.
Nevertheless interesting work.
Working on the formal obituary for Uwe Fink and came across this in his phot collection. From when our building had a more open floor plan.
February 8, 2026 at 11:39 PM
Working on the formal obituary for Uwe Fink and came across this in his phot collection. From when our building had a more open floor plan.
These marbles at the gem show would make a good scale model of the solar system.
February 7, 2026 at 11:33 PM
These marbles at the gem show would make a good scale model of the solar system.
Me: “I’ve seen enough artistic dancers, I’ll be in the other room.”
Spouse a few minutes later: “you need to come back”
Spouse a few minutes later: “you need to come back”
February 7, 2026 at 4:48 AM
Me: “I’ve seen enough artistic dancers, I’ll be in the other room.”
Spouse a few minutes later: “you need to come back”
Spouse a few minutes later: “you need to come back”
To make it even better, a certain alien focused astronomer had been invited to speak at this now canceled event. We did manage to get the invitation rescinded.
www.azcentral.com/story/news/p...
www.azcentral.com/story/news/p...
UA acknowledges it took, kept Jeffrey Epstein money for conference
The latest release of the Epstein files makes clear the University of Arizona knew it got $50,000 from the sex trafficker, but kept the money.
www.azcentral.com
February 7, 2026 at 2:48 AM
To make it even better, a certain alien focused astronomer had been invited to speak at this now canceled event. We did manage to get the invitation rescinded.
www.azcentral.com/story/news/p...
www.azcentral.com/story/news/p...
it amuses me that my last bobcat video got >3x number of engagements than the self promotion "I was recognized with an exoplanet award" post. I feel like "Mr. Market" has voted and I should go into bobcat posting full time.
February 6, 2026 at 2:48 AM
it amuses me that my last bobcat video got >3x number of engagements than the self promotion "I was recognized with an exoplanet award" post. I feel like "Mr. Market" has voted and I should go into bobcat posting full time.
Reposted by Mark Marley
Interesting paper on requirements for undergraduate astronomy degrees and how non-uniform they are, and how this impacts students with these degrees: arxiv.org/abs/2602.03959
The Landscape of Undergraduate Astronomy and Astrophysics Degree Requirements
In this document we summarize the results of a survey of undergraduate degree-granting programs conducted by the 2024-2025 American Astronomical Society Education Committee's Subcommittee on UndeRgrad...
arxiv.org
February 5, 2026 at 5:01 PM
Interesting paper on requirements for undergraduate astronomy degrees and how non-uniform they are, and how this impacts students with these degrees: arxiv.org/abs/2602.03959
Reposted by Mark Marley
Galaxy Slam takes place February 14-21 and features LPL Associate Professors Kris Klein and Ty Robinson! www.youtube.com/watch?v=fhxf...
Galaxy Slam | Arizona vs BYU | Feb. 18
YouTube video by The University of Arizona
www.youtube.com
February 5, 2026 at 4:55 PM
Galaxy Slam takes place February 14-21 and features LPL Associate Professors Kris Klein and Ty Robinson! www.youtube.com/watch?v=fhxf...
A rim walk. Thought you would appreciate @natickbobcat.bsky.social
February 5, 2026 at 12:58 AM
A rim walk. Thought you would appreciate @natickbobcat.bsky.social
Reposted by Mark Marley
Oh. My. Stars. I ❤️ this so much. Proud to be a Wildcat! #beardown
You HAVE to watch this 55 second video. When the muscle of University sports marketing meets the expertise of space science. Features LPL's Ty Robinson and Kris Klein.
youtu.be/fhxf4XpescY
youtu.be/fhxf4XpescY
Galaxy Slam | Arizona vs BYU | Feb. 18
YouTube video by The University of Arizona
youtu.be
February 3, 2026 at 10:53 PM
Oh. My. Stars. I ❤️ this so much. Proud to be a Wildcat! #beardown
The University wrote up a little piece on my receipt of the Lecar Prize from CfA. I appreciate the recognition which of course is truly for all of my wonderful collaborators over the years. science.arizona.edu/news/lunar-p...
Lunar & Planetary Lab director Mark Marley awarded prestigious Lecar Prize
Endowed by the estate of astrophysicist Myron S. Lecar, the prize honors groundbreaking research in extrasolar planets and theoretical astrophysics.
science.arizona.edu
February 3, 2026 at 7:25 PM
The University wrote up a little piece on my receipt of the Lecar Prize from CfA. I appreciate the recognition which of course is truly for all of my wonderful collaborators over the years. science.arizona.edu/news/lunar-p...
You HAVE to watch this 55 second video. When the muscle of University sports marketing meets the expertise of space science. Features LPL's Ty Robinson and Kris Klein.
youtu.be/fhxf4XpescY
youtu.be/fhxf4XpescY
Galaxy Slam | Arizona vs BYU | Feb. 18
YouTube video by The University of Arizona
youtu.be
February 3, 2026 at 5:27 PM
You HAVE to watch this 55 second video. When the muscle of University sports marketing meets the expertise of space science. Features LPL's Ty Robinson and Kris Klein.
youtu.be/fhxf4XpescY
youtu.be/fhxf4XpescY
LPL’s Bill Hubbard (thesis advisor for both me and @jjfplanet.bsky.social ) played a big role in this work.
“Textbooks will need to be updated”: The solar system’s largest planet appears to be smaller and flatter than we knew
www.scientificamerican.com/article/jupi...
www.scientificamerican.com/article/jupi...
Jupiter isn’t as huge as we thought it was
“Textbooks will need to be updated”: The solar system’s largest planet appears to be smaller and flatter than we knew
www.scientificamerican.com
February 2, 2026 at 6:10 PM
LPL’s Bill Hubbard (thesis advisor for both me and @jjfplanet.bsky.social ) played a big role in this work.
First flight on the new Southwest. I miss the old style plastic numeric boarding passes and “turn and burn”. On the other hand with assigned seats the “avoid eye contact to save the empty middle seat” gambit is gone.
February 2, 2026 at 2:35 AM
First flight on the new Southwest. I miss the old style plastic numeric boarding passes and “turn and burn”. On the other hand with assigned seats the “avoid eye contact to save the empty middle seat” gambit is gone.
Instead of doom scrolling how about taking a moment to vote for Flandrau Planetarium in USA Today's online poll? No registration or personal info needed. Thanks!
10best.usatoday.com/awards/fland...
10best.usatoday.com/awards/fland...
Flandrau Science Center & Planetarium at University of Arizona: 2026 USA TODAY 10BEST Readers' Choice Awards
Fresh off its 50th anniversary, Flandrau Science Center & Planetarium continues to inspire guests through innovative exhibits and immersive star talks. At its heart is the beloved 146-seat, full-dome ...
10best.usatoday.com
January 30, 2026 at 10:58 PM
Instead of doom scrolling how about taking a moment to vote for Flandrau Planetarium in USA Today's online poll? No registration or personal info needed. Thanks!
10best.usatoday.com/awards/fland...
10best.usatoday.com/awards/fland...
Reposted by Mark Marley
New paper just out from my soon-to-graduate Ph.D. student Matthew Belyakov. He got JWST to look at 3I/Atlas in the mid-infrared. And there is water! and CO2! and CH4! and Ni! It's just a beautiful spectrum (and I love a beautiful spectrum). arxiv.org/abs/2601.22034 🔭
January 30, 2026 at 3:28 PM
New paper just out from my soon-to-graduate Ph.D. student Matthew Belyakov. He got JWST to look at 3I/Atlas in the mid-infrared. And there is water! and CO2! and CH4! and Ni! It's just a beautiful spectrum (and I love a beautiful spectrum). arxiv.org/abs/2601.22034 🔭
I am sorry to share the news of the passing of LPL Professor Emeritus Uwe Fink. Uwe was a stalwart member of LPL, joining the lab back in 1967. He worked on many topics, especially spectroscopic studies of planets, satellites, nebulae, asteroids, and comets.
January 29, 2026 at 2:46 AM
I am sorry to share the news of the passing of LPL Professor Emeritus Uwe Fink. Uwe was a stalwart member of LPL, joining the lab back in 1967. He worked on many topics, especially spectroscopic studies of planets, satellites, nebulae, asteroids, and comets.
An important part of our atmospheric and evolutionary modeling is to benchmark against objects and learn from what the models do and do not do well. This new paper by Mader et al. takes a current look at our cloudy models. arxiv.org/abs/2601.18866
🔭
🔭
January 28, 2026 at 10:06 PM
An important part of our atmospheric and evolutionary modeling is to benchmark against objects and learn from what the models do and do not do well. This new paper by Mader et al. takes a current look at our cloudy models. arxiv.org/abs/2601.18866
🔭
🔭