These are shells of dust coming off a pair of tightly bound stars, newly imaged by #JWST. There is such beauty in the universe.

Our special November issue, celebrating 30 years of exoplanets, is now here! https://bit.ly/483MH9I #astronomy #exoplanets

New paper from my group! Stars aren’t born alone—they form in massive associations. If we want to understand how stars and planetary systems form, we need to figure out where today’s clusters came from… and where all their long-lost siblings ended up. arxiv.org/abs/2511.07533

My talk is tomorrow! FEAR: the impact of killer whales on baleen whales. Streaming: hmsc.oregonstate.edu/main/science...

My most important service to solar system planetary science was being a part of the Science Definition Team (SDT), nearly a decade ago, that made the science case for an NASA Ice Giants Orbiter and Entry Probe. Check out our 2017 document: arxiv.org/abs/2511.13946

🧪🔭⭐ #exoplanets #exoplanet #youngplanets New paper from our group and @madysonbarber.bsky.social today! We report a brand-new planet around a <50 Myr star—adding to a very small (but rapidly growing!) population of the youngest known transiting planets. Paper: arxiv.org/pdf/2511.10734

#SciML fact of the day: automatic differentiation fails to give the correct derivative on a lot of very simple functions 😱 😱 😱 . #julialang #automaticdifferentiation youtube.com/shorts/KTguZ...

RIP George Smoot. My first project in astrophysics was with George's group at Lawrence Berkeley Laboratory. That summer I showed that the COBE temperature fluctuations were consistent with a Normal distribution, which I did not realize at the time was a confirmation of a prediction of inflation.

Congratulations to @kelbadry.bsky.social for becoming a McArthur genius!!! 🤩🥳 www.caltech.edu/about/news/k... 🔭🧪🎢

Yall check this out, it’s the top coolest thing I’ve seen in a while, closed form autodiffable representation of optical interferometry, enormously powerful. Yes!!

So exhausting..

The statue of Pasteur in Paris faces the Invalides where Napoleon is buried. This is apt as one fought germs, while the other fought Germans.

Excellent review paper on prospects for high-precision photometry of exoplanet systems with JWST by Sarah Millholland & Joshua Winn: www.pnas.org/doi/10.1073/...

Not only did this paper get published, but the author, Thomas Count Dracula, received the “Best Author of the Month” award. www.easpublisher.com/article/arti... h/t @bluewhalenews.bsky.social

Astronomy 🔭 and physics ⚛️ GRFP applications are due Nov 14! Only seniors and 1st-year grad students can apply now (no second years).

Today Sept 27, 2025. It marks a special mathematical date because the numerals of the date form perfect squares. Written as 09/27/2025, it becomes 9,272,025, which is the square of 3,045. When written in the European format 27/09/2025, it becomes 27,092,025, the square of 5,205.

Can an expert tell me if these error bars are accurate? arxiv.org/abs/2509.17454

Congrats to Univ of Washington's Prof. Josh Krissansen-Totton (former UCSC postdoc!) on being selected for the AGU Ronald Greeley Early Career Award in Planetary Sciences www.agu.org/user-profile...

A High-Precision, Differentiable Code for Solar System Ephemerides (Cassese et al in press) arxiv.org/abs/2509.19549

On the 🔭🧪 postdoc job market? Excited about science with Rubin and big surveys? Come join us at DiRAC. I’m so excited that we’re able to offer a few of these Fellowship positions this year! Please share, LMK if you have Q’s! aas.org/jobregister/...

Pythagorean Triple Square Day, as one man affectionately calls 9/16/25, is a day like no other this century.

youtu.be/Jx5SxWqpjjI 🔭 AAS Journal Author Series: Richard Zeebe and David Hernandez on 2025AJ....170...71Z Richard Zeebe (University of Hawaii at Manoa) and David Hernandez (Yale University) chat about their article on stellar flybys of the solar system and their (lack of) effect on the Earth.

Sorry Google and @wikipedia.org but this is not correct. Half of the Nobel prize was awarded to Penrose for the mathematical theory of black holes; the other half to Genzel & Ghez for their study of Sgr A*. (Thanks @nytgames.bsky.social Connections for alerting me to this!)

TIL that I study “space balls” (71 down in Sunday’s NYT crossword).

The Rocky Worlds DDT has published our final target list. Join us for an information session on September 15 to learn more about the 9 targeted planets and the goals of the program. 🔭 #exoplanets

Hey #exoplaneteers (and other early career folks) - applications for the 2026 NASA Hubble Fellowship Program are open! www.stsci.edu/stsci-resear...

The exoplanet TRAPPIST-1 d intrigues astronomers looking for possibly habitable worlds beyond our solar system because it is similar in size to Earth, rocky, and resides in an area around its star where liquid water on its surface is theoretically possible. (1/5) 🧵 🔭 🧪

Today on the #arXiv: Santana-Ros et al. 2025, "Temporal Evolution of the Third Interstellar Comet 3I/ATLAS: Spin, Color, Spectra and Dust Activity" - arxiv.org/abs/2508.00808 The nucleus of #3I/ATLAS remains confused with the coma.

We are pleased to announce the release of the #JWST Cycle 5 Call for Proposals for General Observer and Survey time and funding for Archival Research programs. Read more: ow.ly/IjWC50WyF62

aww yeah ☄️ 🔭 🛰️ arxiv.org/abs/2507.21967

Big day for the matriarchy! 🥳 Huge congrats to the awesome Prof. Doughtery, lead on the Jupiter-bound ESA JUICE mission & STFC Exec Chair. If anyone's confused on the astro royal hierarchy: Michele and I are the astro equivalents of 🇬🇧Westminster and 🏴󠁧󠁢󠁳󠁣󠁴󠁿Holyrood 🤗 ℹ️: www.bbc.co.uk/news/article... 👩‍🔬🔭🧪

Scientists have released the closest images ever taken near the sun, captured by NASA’s Parker Solar Probe flying 3.8 million miles above the solar surface. See more images of solar eruptions on the sun: wapo.st/3Irm3P3

A tiny ray of light - 51 Peg B postdoc applications just opened, and UW Seattle is a host institution! I'm our new institutional contact - more soon but reach out if you have questions! ☺️

All those cameras at Mars in October....

For any asteroid observers who have not heard about it already: Newly-discovered #A11pl3Z is a candidate interstellar object. cneos.jpl.nasa.gov/scout/#/obje...

New paper out! This is a review of the published JWST observations of rocky exoplanets so far: arxiv.org/abs/2507.00933 Quick summary of the key points:

@nytimes.com article about Nate Kaib's and my recent paper on the future stability of the Solar System when passing stars are accounted for. www.nytimes.com/2025/06/28/s...

I just found the source of dark energy

Dr. Vera Rubin is the first Astronomer to be featured on a US Coin. Rubin is also the namesake of the new Rubin Observatory in Chile, honored for her discovery of evidence of dark matter in galaxies. rubinobservatory.org www.usmint.gov/news/press-r...

I'm talking about how the fear of orcas affects baleen whales on Monday at Science on Tap in Seattle, always an incredible audience asking lots of interesting questions www.scienceontap.org

Here it is: www.youtube.com/watch?v=MIJf...

@plotastro.bsky.social This is a pretty visualization of hydrocarbon opacities in the atmosphere of Titan in arxiv.org/abs/2506.12144

Introducing...your sneak peek at the cosmos captured by NSF–DOE Vera C. Rubin Observatory! Can you guess these regions of sky? This is just a small peek...join us at 11am US EDT for your full First Look at how Rubin will #CaptureTheCosmos! 🔭🧪 #RubinFirstLook ls.st/rubin-first-look-livestream

I’m verklimt.

Apparently we’ve been observing transiting exoplanets all wrong…

Transit-timing variations grow with orbital period, enabling detection of low-mass planets, invisible to other techniques (radial-velocity, astrometry or direct imaging), in their stars' habitable zone (HZ). This work detects an HZ planet using Kepler data of a transiting exoplanet.

Save NASA Science: Please join me in signing this petition from The Planetary Society, urging Congress to reject the deep cuts to science that have been proposed by the administration. www.planetary.org/advocacy-act...

Wikipedia (English) features a planet system which we announced eight years ago.