This is the most important thing you will read today – and probably the whole year, honestly. We cannot let the AMOC collapse. For one thing it will make Iceland uninhabitable, and I would really like my children and grandchildren not to become refugees. But the effects will be almost everywhere.

From the ocean to the exosphere, we’re dedicated to advancing Earth system science for the betterment of society– not just on #EarthDay but every day! 🌎 Our experts harness observations, models, instruments, HPC & other resources to ensure NSF NCAR supports cutting-edge research.

Super view of Toronto from the hotel room!

Just released: "Mission Aborted: How NASA Illegally Implemented the President's Budget Request Without Congressional Approval" - Minority Staff Report Prepared for Members of the Committee on Science, Space, and Technology, US House of Representatives democrats-science.house.gov/imo/media/do...

It's Day 2 of our #WeekofAction to #SaveScience, and we are calling our members of Congress! Use the "Phone" tab on our form and you'll get a phone call connecting you to each of your congressional offices: aas.org/reject-2027-... 🔭

Unexpected EHT intern alert! This bird had gotten lost in the fog and appeared at the IRAM 30-m control room door- more than 1,500 meters above its usual habitat. After a brief "internship," it was safely released back into nature the next morning. #M87MOVIE

I'm delighted to point you to a new paper we just got published in Ap J Letters: "Carbonaceous Chondrite-like Compositions for Proposed Captured Trans-Neptunian Objects Justitia and Pompeja" Enjoy! 🔭🧪

I am so thrilled to share this guide to the observations that the #ArtemisII crew will be making during their closest approach to the Moon!! I hope you'll follow along! science.nasa.gov/resource/art...

Hot off the press: “Reversal of Spin: Comet 41P/Tuttle–Giacobini–Kresak” by David Jewitt in The Astronomical Journal

This rarely-seen Glass Octopus was caught by an underwater robot during an expedition off the Phoenix Islands.

Just in: UCAR has filed a lawsuit against NSF, the Commerce Dept, NOAA, and OMB to prevent the dismantling of NCAR, alleging "violations of the Constitution and the Administrative Procedure Act."

I cannot reiterate enough with the frequency and gravity it deserves that every reinfection increases the cumulative risk of Long COVlD. Our PMC survey data (n>2,000) suggest it is rare to avoid LC after 5+ known infections. I'll talk more about that again Sunday night in Becky's Space.

Heartbreaking, really

This will be an instant classic. I'm wondering what paper I can throw together as an excuse to cite it. Although the Arp Atlas was published in the ApJ Supplement in the 60s, you really had to get the book atlas itself, comprising bound photographic prints. 1/n iopscience.iop.org/article/10.3...

CO2 is now affecting the body chemistry of humans If the current levels of emissions are maintained, we could be facing potentially toxic atmospheric compositions within 50 years THIS IS STAGGERING AND DEVASTATING NEWS link.springer.com/article/10.1...

For the final day of #BlackHistoryMonth, let's celebrate the current generation of Black scientists and engineers—including Ashley Walker (@that-astro-chic.bsky.social), researcher of planetary atmospheres and founder of BlackInAstro (www.blackinastro.com)! 🧪🪐⭐🔭 #WomenInSTEM

🎥 2026 AAS Journals Author Series Update! Frank Timmes, AAS Journals Scientific Editor, shares the “why” behind the series — why we create these videos, what the metrics show, how we reached 500+ videos, and how featured articles are selected. 🔭 youtu.be/1_U5WsSXzmU @publishing.aas.org

#BlackWomen #BlackHistoryMonth #Inventors #STEM #STEAM x.com/i/status/202...

Ok I promise this is the last picture of my comet that I'll post but I think this one is my favorite. Image by Beáta Ujvárosi.

A quad-jet to commemorate Ilya Malinin’s Olympic quad-jumps!

Congrats to @wierzchos.bsky.social on this beauty! C/2024 E1 (Wierzchoś) is putting on a show for southern hemisphere observers right now. 📷 by renowned comet photographer Gerald Rhemann. 🔭

🔭 Group picture from the referee training workshop at AAS247. I usually participate but had a conflict this time. Front and center, with a AAS corridors t-shirt, is Frank Timmes who has organized and run all of them to date.

Though less destructive than coronal mass ejections, moderate space weather events like stream interaction regions can still cause geomagnetic storms. Researchers have used machine learning to investigate the drivers behind these events. aasnova.org/2026/01/14/w... 🔭🧪

So happy to have contributed to this effort led by Sarah Greenstreet - now published in #ApJLetters! #AAS247 #TeamAsteroid #RubinObs @vrubinobs.bsky.social

✨ Happy 21st Birthday Europlanet! It's been a long journey since the foundation on 1 January 2005, and we would like to thank you highlighting 21 things we are proud of: www.europlanet.org/21-years-of-...

Quietly proud that we published 351 Research Notes of the American Astronomical Society last year, a new record. Short, moderated contributions on topics from multiple star systems (Vol 9, No 1: iopscience.iop.org/article/10.3...) to SETI and 3I/ATLAS (iopscience.iop.org/article/10.3...) cc @aas.org

✨ Wrapping up 2025 with our Top 5 read articles! Finally, #1: ‘New Constraints on DMS and DMDS in the Atmosphere of K218 b from JWST MIRI’ in The Astrophysical Journal Letters’ This research redefines how we search for life beyond Earth.🪐👉 https://doi.org/10.3847/2041-8213/adc1c8 #Exoplanets #JWST

✨ Wrapping up 2025 with our Top 5 read articles! At #3: ‘Search for Gravitational Waves Emitted from SN 2023ixf’! This study sharpens the tools for future discoveries and knowledge of our universe. 🌌👉 https://doi.org/10.3847/1538-4357/adc681 Come back tomorrow for #2! 👀#Astrophysics #Supernovae

Well done, comet Kacper!

A little 3I/ATLAS update building on @marshall-eubanks.bsky.social's nice RNAAS from last week. Given its non-grav acceleration and the rate at which it's losing mass, you can work out its size. The answer: a diameter around 1 km, very typical for comets. arxiv.org/abs/2512.18341 🔭 🧪

A recent scientific paper compared long-term mortality by vaccination status. I noticed that Table 2 drew a lot of attention, but was actually included in the paper as a static image. So I built a quick dataviz project to explore. 🧵

THREAD. My parents' cat Bridget vanished. As the weeks dragged on they became ever more worried, so to distract himself my dad began to paint Bridget's adventures, imagining her travelling through time and popping up at some of art & music's most important moments. I've collected his work here...

#AGU25 folks, there is a rapid- response town hall TODAY on the #NCAR dismantling at 1 pm, La Nouvelle Orleans ballroom C (per an AGU media advisory)

The dismantling of NCAR should be the trending story on Bluesky, not the fucking Oscars leaving ABC for YouTube.

Here's our reporting on the proposed dismantling of the jewel of US atmospheric science, @ncar-ucar.bsky.social. The plan is to break NCAR apart and disburse some parts to other locations (like the research aircraft fleet) and eliminate others. www.nature.com/articles/d41... 🧪 #AGU25 #climate

Hi friends, please help me spread the word on the open professor position in #planetaryScience we have in Bern 🔽

This would be a terrible act. It was also my last major assignment at NSF so it feels personal.

Attendance at US-based science conferences is bouncing around this year but generally down. #AGU25 has ~10k fewer this year! I explored these trends for @nature.com — including solutions to keep conferences local & productive: www.nature.com/articles/d41... 🧪

NEW: When she worked at NASA’s JPL, Amy Mainzer used to rack up high scores on the 1979 Atari game ASTEROIDS. Very apt, now she’s in charge of a space mission that will save the world from killer asteroids. Planet Protector, my new feature for @science.org, is live. www.science.org/content/arti...

NSF reorganization is, frankly, a bit odd, and we haven't run a story on it partly because it's hard to know what to make of it. The impetus for reorg, as I understood it, was to limit the siloing that occurs because NSF has so many (35ish) divisions. Now there will be 50+ sections.

Yesterday was bittersweet. I lunched w/ former coworkers at GEO/AGS and saw the NSF building for the last time. I got caught up on folks’ lives and was reminded of everything that has been lost & taken in 2025. I also got my Director’s Award certificate, shared with 44 others for solar eclipse work!

Some have argued to me strongly that even if Loeb is wrong, he’s getting people interested in 3I/ATLAS and that’s a good thing for science. But Loeb isn't just wrong, he's recklessly following an old playbook that got 39 people killed in 1997. sites.psu.edu/astrowright/...

An outstanding PhD dissertation about important, original Venus science. Superbly written, rigorous, spans theory and observation. The public defense was also excellent.

What’s your cat up to today? Here’s Jaxon enjoying my cup of water #caturday

Information and traveler recommendations from @agu.org for #AGU25 regarding US "Federal presence in New Orleans": www.agu.org/agu25-neworl...

1st quarter-final of ✨ #planetaryScience image of 2025✨ This round features Mars 🧪⚛️ 🗳️ Voting ends on Monday, Dec. 9, at 3 p.m. UTC/4 p.m. CET/10 a.m. EST/7 a.m. PST/midnight JST. Here are the four quarter finalists 🔽

Stars appear to sweep over NSF–DOE Rubin Observatory in this long exposure thanks to Earth's rotation. But Rubin will soon capture objects truly in motion! Over the next 10 years, it'll spot millions of changes each night & generate more data than all human writing in history🤯

chapter 7 about evolutionary processes in the Centaurs region by Kokotanekova et al. has hit the arXiv! arxiv.org/abs/2511.19554

"Huge if True" podcast visited Mt. Lemmon and the Catalina Sky Survey @catalinaskysurvey.bsky.social youtu.be/LOn-mmezykQ?...