Paul Halpern @phalpern.bsky.social Physicist and Science Writer. Author of nineteen books, most recently THE GREAT ATOM DEBATE: ERNST MACH, LUDWIG BOLTZMANN, AND THE BATTLE FOR THE ESSENCE OF REALITY https://greatatomdebate.com/
Ethan Siegel @startswithabang.bsky.social Cosmologist, science communicator, author, speaker, and longtime writer of Starts With A Bang.
Not the next Carl Sagan; the first Ethan Siegel.
Ryleigh Davis @import-astrory.bsky.social Planetary scientist & postdoc @UCSD 🪐 • interrogating icy moons with telescopes 🔭 • Europa Clipper MISE postdoc affiliate 🛰️ • outpaced daily by my 2-year-old 🏃♀️ • Prior: PhD @Caltech, MS@NAU, BS@UofA • she/her
Alexandra Witze @alexwitze.bsky.social Science journalist and correspondent for Nature (she/her). Opinions = my own. Reach me at alexwitze.01 (Signal), witzescience (@gmail.com), or awitze (@protonmail.com).
Rubens Machado @rgmachado.bsky.social astrônomo, professor do IAG/USP
Laura Lopez @ohdearz.bsky.social Professor of astronomy 🔭 at Ohio State. Co-chair of @aascsma.bsky.social. Alum of UCSC and MIT. She/her 🇲🇽
Prefeitura do Campus Capital-Butantã da USP @puspcb.bsky.social A Prefeitura do Campus USP Capital-Butantã (PUSP-CB) é responsável por planejar e gerir os espaços comuns e da infraestrutura do Campus
https://linktr.ee/usp.prefeituracapital
Luis Salazar Manzano @lesamz-astro.bsky.social Astro PhD candidate at UMich
Ken Jennings @kenjennings.bsky.social Your Jeopardy! pal. Author of THE COMPLETE KENNECTIONS (http://bit.ly/4qUcbhK) and a bunch of other stuff.
Ben Sharkey @bsharkey.bsky.social astronomer, archivist at U. Maryland (Small Bodies Node). aspiring killjoy.
Ciência USP @cienciausp.bsky.social O melhor da Ciência feita na universidade. Produção: Editoria de Ciências do Jornal da USP
ciencia.usp.br
Arthur Loureiro @cosmonist.bsky.social aka, the grumpy ranting cosmologist.
Galaxies of the Universe, UNITE!
🇧🇷 Cosmologist based in 🇸🇪
PI Researcher @ The Oskar Klein Centre
& Imperial College visiting researcher.
https://medium.com/@cosmonist
He/Him - ENG & PT (Opinions all mine)
Science Fiction and Fantasy Writers Association @sfwa.bsky.social SFWA promotes, advances, and supports science fiction and fantasy storytelling by educating, promoting, and empowering its creators and the larger community. This account is for informational purposes.
N. K. Jemisin @nkjemisin.bsky.social Writer. She/her.
Marshall Eubanks @marshall-eubanks.bsky.social A physicist with a lead role in creating two Very Long Baseline Interferometry (VLBI) systems, for JPL & the USNO. Now Chief Scientist at Space Initiatives Inc, developing picospacecraft for use in deep space. Asteroid (6696) Eubanks is named in his honor.
Hurum Maksora Tohfa @hurumt.bsky.social Astrophysics grad student @UW
Qicheng Zhang @cometary.org 
USP - Universidade de São Paulo @uspoficial.bsky.social A USP é uma universidade pública, mantida pelo Estado de São Paulo e vinculada à Secretaria de Estado de Desenvolvimento Econômico, Científico e Tecnológico.
Steve Desch @deschscoveries.bsky.social Professor of astrophysics / planetary science / meteoritics at Arizona State University.
Micro SF/F by O. Westin @microsff.com Very short science fiction/fantasy stories by O. Westin.
Please repost any you like.
Patreon: https://patreon.com/microsff
Ko-Fi: https://ko-fi.com/microsff
Books: https://microsff.com/books
Aaron Reichlin-Melnick @reichlinmelnick.bsky.social Senior Fellow at the American Immigration Council. Commenting generally on immigration law and policy. Retweets =/= endorsements, views are my own.
Orcspiration @orcspiration.bsky.social YOU MUST TAKE CARE OF YOURSELF IF YOU WANT TO VANQUISH YOUR ENEMIES. I WILL HELP. (by @nora.zone, icon by Delapouite at https://game-icons.net)- E Eric Mamajek @ericmamajek.bsky.social Star guy. Statements and opinions posted here are my own.
Angela Collier @acollierastro.bsky.social Theoretical Physicist.
(She/her/hers)
From Eastern KY.
Michele Limon @michelelimon.bsky.social Photons collector, boater, nerd. - A Matthew Hopkins @astrohopkins.bsky.social Trombonist with a side-gig studying interstellar objects.
Bryce Bolin @brycebolin.bsky.social Research scientist at Eureka, Scientific. Small bodies of the Solar System. Avid paraglider pilot and traveler.
Naomi Novik @naominovik.bsky.social author, coder, fangirl, geek. 🌕🌖🌗🌑 Author of Spinning Silver, Uprooted, Temeraire, & The Scholomance. Latest Release: THE SUMMER WAR
https://lnk.bio/naominovik
Tony Dunn @tony873004.bsky.social Orbit simulations of planets, comets, asteroids and other interesting stuff. Amateur astronomer. BA: Physics & Astronomy, SFSU.
P. Djéli Clark | The Disgruntled Haradrim @pdjeliclark.bsky.social Historian. Writer. Jumbie & Duppy Conqueror. Rambler of Things. Doer of Stuff. Brotha From Another Planet | pdjeliclark.com
Gizmodo @gizmodo.com The future is here.
Dragons of Wales @dragonsofwales.bsky.social Dreigiau o Gymru. Aka Andy Frazer. Illustrator of dragons and dinosaurs. All books available in my Etsy shop. Please DM for commission enquiries. He/him. European/Welsh. No AI. www.andyfrazer.com
Andrew J. Steinmetz @ajsteinmetz.com Physics Ph.D., Academic Professional at #GeorgiaTech, and #UniversityOfArizona alumnus. I love ⚛️ physics, 🌌 astronomy and all 🧪 sciences! (views my own) https://ajsteinmetz.github.io/
Rubin LSST:UK @lsstuk.bsky.social The UK contribution to the NSF-DOE Vera C. Rubin Observatory @vrubinobs.bsky.social Legacy Survey of Space and Time (LSST). https://www.rubin.ac.uk/
Asteroid Institute, a program of B612 @b612-asteroid.bsky.social Developing tools and technologies to understand, map, and navigate our solar system and protect our planet from asteroid impacts. Learn more
B612foundation.org
B612.ai
schweickartprize.org
Abby Lee @abigaillee.bsky.social NASA Astrophysicist unlocking secrets of the Universe
Dr. Nick Attree @nickattree.eurosky.social Planetary scientist @iaacsic.bsky.social, working on @esa.int Rosetta & @cometinterceptor.bsky.social (Nucleus WG chair). Prev @TU-Braunschweig.de, @LAM, @QMUL, @physicsuol.bsky.social 🇬🇧🇪🇸🇪🇺
https://sites.google.com/view/nickattree
ORCID: 0000-0003-3344-6693
Seth Jacobson @sethajacobson.bsky.social Planetary Scientist @MSU www.planetarymakerspace.org
Jessica Birky @jessbirky.bsky.social Astrophysics + data science grad at University of Washington
she/her 🏳️🌈
https://jbirky.github.io/
Prof. Abel Méndez @profabelmendez.bsky.social Planetary Astrobiologist and Director of the
@PlanetaryHabLab. http://astrodon.social/@profabelmendez #exoplanets #astrobiology #habitability
Roman for Scientists @nancyromansci.bsky.social NancyRomanSci is managed by the Roman Science Centers and provides researchers with the most up-to-date information related to doing science with NASA's Nancy Grace Roman Space Telescope
Mark Giovinazzi, PhD @markgiovinazzi.bsky.social Astronomy Postdoctoral Fellow at Amherst College. Previously, University of Pennsylvania (PhD/NSF). Exoplanets, low-mass stars, and binary systems. (he/him/his)
Meredith Rawls @merrdiff.bsky.social Astronomer at UW, data pipeline wrangler for Rubin Observatory, satellite mitigation leader via IAU CPS SatHub, mom, violist, Ballardite (Seattle), family cargo e-bike evangelist, Episcopalian, etc. Opinions all mine
Erin M. May, PhD @astronomay.bsky.social Staff Astronomer @ a place - Exoplanet Atmospheres. All data is good data.
Plus Knitting, Stickers, Baking, and other crafty things. Toddler mom.
Previously known as @_astronoMay on the other site.
ErinMMay.com
SiderealStickers.Etsy.com
AoT - Philly @astroontapphilly.bsky.social Astronomy on Tap: Philly
Next event, July 16th 6-8 PM @ Fergie’s Pub
Kacper Wierzchoś @wierzchos.bsky.social Astronomer. Comet hunter. Fan of all things analog.
https://www.youtube.com/@Kacper_Wierzchos
Will Sutherland @wskeller.bsky.social Ph.D. candidate at U Washington, social studies of science and computer supported cooperative work.
Dr Jake Taylor @astrojake.bsky.social Astrophysicist at the University of Oxford. Researching the atmospheres of exoplanets.
Mike Boylan-Kolchin @mbkplus.bsky.social Dad, husband, astrophysicist, dog herder. Samuel T. and Fern Yanagisawa Regents Professor in Astronomy at UT Austin. This is a personal account and the views expressed in my posts here are mine. https://mrbk.github.io
Prof Anna Watts @profannawatts.bsky.social Professor of Astrophysics @ Univ. of Amsterdam. Neutron stars, pulsars, dense matter, X-ray astronomy. Mom, Migrant. "Particles in stars blah blah". Does science with NICER on the International Space Station and schemes for EVEN BIGGER SPACE TELESCOPES.
AGU (American Geophysical Union) @agu.org Official AGU: supporting 500k+ Earth & space science advocates.
🌏 🚀 🔬
Save the Date for #AGU26 in San Francisco, CA, 7-11 December, 2026.
The New York Times @nytimes.com In-depth, independent reporting to better understand the world, now on Bluesky. News tips? Share them here: http://nyti.ms/2FVHq9v
MurderBotBot @murderbotbot.bsky.social Bot that tweets quotes(incl spoilers) from
@marthawells.com The Murderbot Diaries. Has no gender. Character's pronouns are It/its. Managed by @writerphoebe
Bernardita Ried Guachalla @bernarditaried.bsky.social 🌲 PhD Astrophysics student at Stanford University with a Fulbright scholarship
🎓 MSc in Physics Universidad de Chile
🔭 NOIRLab ambassador
🖤 Observational Cosmology
Sometimes u'll find Spanish here 🇨🇱
Robin Hobb @robinhobb.bsky.social Writer of fantasy and SF. Gardener. Chicken tender. Dog Person but cat friendly. Washington state USA. Old and getting older. Stay off my lawn! No AI ever. All posts from me.
ESA Operations @operations.esa.int From Earth orbit to deep space: sharing the excitement of real-time mission operations at the European Space Agency. Home for ESA's teams working on Planetary Defence, Space Weather, Clean Space & Space Debris.
esa.int/Operations
esa.int/Space_Safety
Kari Byron @karibyron.bsky.social Mythbuster, CrashTest Girl, National STEM Festival, EXPLR
Prof. Sam Lawler @sundogplanets.mastodon.social.ap.brid.gy Professor of astronomy, farmer of goats. Asteroid (42910). She/her.
Living and learning on the land and under the skies of Treaty 4 (Saskatchewan, Canada) […]
🌉 bridged from ⁂ https://mastodon.social/@sundogplanets, follow @ap.brid.gy to interact
Terence Tao @teorth.bsky.social Mathematician at UCLA. My primary social media account is https://mathstodon.xyz/@tao . I also have a blog at https://terrytao.wordpress.com/ and a home page at https://www.math.ucla.edu/~tao/
Science Explorer (SciX) @scixcommunity.bsky.social News and information for the Science Explorer (SciX) user community. Explore with us at SciXplorer.org
Shannon Stirone @shannonstirone.bsky.social Writer in nyc. Space nerd. Mars is a Hellhole. Bylines in NYT’s, The Atlantic, Wired, Esquire, Longreads, & others. Anti fascist. Opinions are mine. Climate by day.
signal: shannonstirone.78
https://natureofthings.substack.com/
shannonstirone.com
Science Magazine @science.org Cutting-edge research, news, commentary, and visuals from the Science family of journals. https://www.science.org
Michael Busch @michael-w-busch.bsky.social Planetary astronomer, studying piles of rock in space. Reader of books. Drinker of tea. He/him. This is a personal account. To bigotry no sanction.
American Physical Society @apsphysics.aps.org Fostering a vibrant, inclusive, and global community dedicated to science and society. Join us: http://go.aps.org/2NWWEeY
Starzanplanets @starzanplanets.bsky.social Astrophysics | Planetary Science | American Astronomical Society Journals | “Centaurs” AAS/IOP book | DEIA | LGBTQIA+rights | photography
Mary Robinette Kowal @maryrobinettekowal.com Hugo, Nebula, and Locus Award-winning and USA Today best-selling author, narrator, and professional puppeteer. Also has a talking cat. Latest title: Apprehension.
Wraithmarked Creative @wraithmarked.bsky.social Boutique sci-fi/fantasy publisher ⚔️
Maker of pretty books 📚
Our parents wish we had "real" jobs 🤦♂️
LINKS: linktr.ee/wraithmarked
WIRED @wired.com For Future Reference.
Sign up for our newsletters: https://wrd.cm/newsletters
Find our WIRED journalists here: https://go.bsky.app/Boj9b5E
Becka Phillipson @beckastrosaurus.bsky.social Astro/Physicist @Villanova | Philadelphia, PA | research in nonlinear dynamics, accreting compact objects, and wacky time-varying phenomena
any views are my own and not of my employer :) stuff and things
Grant Tremblay @granttremblay.com Astrophysicist at the Center for Astrophysics | Senior Vice President, American Astronomical Society
Rob Seaman @robseaman.bsky.social Data scientist, archivist, and temporal engineer with the Catalina Sky Survey. CSS has discovered about half of all known near-Earth asteroids, including several small impactors, many comets, and a couple of mini-moons. https://catalina.lpl.arizona.edu
Benjamin Pope @benjaminpope.bsky.social Australian astronomer
he/him
Sydney/Gadi
Alt National Park Service @altnps.bsky.social The official "Resistance" team of U.S. National Park Service. Our website: www.ourparks.org
David Gerdes @davidgerdes.bsky.social Professor, astrophysicist, cyclist, homebrewer and beekeeper
Joanna Drążkowska @astrojoanna.bsky.social Astrophysicist ✨ Research Group Leader at MPS Göttingen 🇩🇪 Planet formation theory 🪐 she/her
https://www2.mps.mpg.de/homes/drazkowska/
Malena Rice @malenarice.bsky.social Planetary astrophysicist • Assistant Professor, Yale Astronomy • exoplanets & solar system • Forbes Under 30 • astrosoundbites
Dan F-M @dfm.io Retired computational astrophysicist
Interpretability at Anthropic; prev Google DeepMind, Simons Foundation, Journal of Open Source Software
(he/him)
https://dfm.io // https://github.com/dfm
Ethan Vishniac 🇺🇦🇨🇦🇺🇸 @ethan-vishniac.bsky.social Cantankerous astrophysicist and editor. Grandfather and dog owner. I could probably drink less coffee. I think about magnetized turbulence and what it means for the universe.
Orcid 0000-0002-2307-3857
Anne Verbiscer @verbiscer.bsky.social Deputy Project Scientist on NASA's New Horizons mission. Participating Scientist on NASA's Lucy Mission. Minor Planet 9726.
sanjana! @sanjanacurtis.bsky.social big fan of stars 💻✨🦫🏳️🌈
Emily Lakdawalla 🏳️⚧️ Uranus Expert @elakdawalla.bsky.social Planetary scientist, freelance science writer and space artist, queer, ADHD, mom. Turns out it’s hard to be all those things at once. Shop at elakdawalla.Etsy.com
Julianne Dalcanton @dalcantonjd.bsky.social Astrophysicist at the Center for Computational Astrophysics & U. Washington. 
Jonathan McDowell @planet4589.bsky.social Astrophysicist
Support the work of Jonathan's Space Report:
https://www.gofundme.com/f/fund-jonathans-space-report-library-transition
Katie Mack @astrokatie.com Cosmologist, pilot, author, connoisseur of cosmic catastrophes. TEDFellow, CIFAR Azrieli Global Scholar. Domain verified through my personal astrokatie.com website. She/her. Dr.
Personal account; not speaking for employer or anyone else.
Jonathan O'Callaghan @astrojonny.bsky.social Freelance space journalist. British Science Journalist of the Year 2024. Words in The New York Times, Scientific American, New Scientist, BBC, WIRED, + more.
Bangkok, Thailand
jdaoca@gmail.com
@astro_jonny on Twitter
https://www.jonathanocallaghan.com/
Phil Plait @philplait.bsky.social Bad Astronomer (formerly @BadAstronomer), SciCommer, Dork. Crash Course Astronomy guy. He/him. Newsletter: badastronomy.beehiiv.com
I'm self-employed so my opinions do in fact represent my company's.
Zach Weinersmith @zachweinersmith.bsky.social New Book out this summer: Sawyer Lee and the Quest to Just Stay Home.
Other things of mine: Bea Wolf, A City on Mars, and SMBC
Website: www.smbc-comics.com
Patreon: https://www.patreon.com/ZachWeinersmith?ty=h
arXiv @arxiv.bsky.social We're arXiv, the open access repository sharing discoveries and breaking down barriers to cutting edge science for over 30 years.
Peter Ferguson @theotherpsf.bsky.social Astronomer, helping to make the Vera C. Observatory a thing and use it to look for dark matter.
Currently a DiRAC fellow at UW/Seattle
He/Him
Sarah Hörst @planetdr.bsky.social Professor of planetary science at Johns Hopkins. Titan’s biggest fan. Pomeranian wrangler. Runner. Love many, trust few, always paddle your own canoe. She/her. sarahhorst.com
Planetdr.26 on signal
Harrison Agrusa @harrisonagrusa.bsky.social Asteroid 28888
Postdoc at Observatoire de la Côte d’Azur
Dr. Adeene Denton @spacewhalerider.com Planetary scientist, earth + space science historian, dancer/choreographer, part-time community radio DJ. (they/she) 🏳️🌈
adeenedenton.com
Matthias M. M. Meier @matthiasmmmeier.com Meteorites, Museums, Mars, Mountains and many more things. Meteoriticist, Noble Gaser, Space Nerd, Family Man. Director of Naturmuseum St. Gallen, Switzerland. Posts in English and German. Private account.
🇨🇭🇸🇪🇲🇫🇪🇺🇺🇦 orcid.org/0000-0002-7179-4173
Barbara Ryden @bsryden.bsky.social Writer of astrophysics textbooks, servant to cats
Juliette Becker @jcbecker.bsky.social Currently trying to understand planet formation as a professor of astronomy at the University of Wisconsin-Madison
Lucas Simões @lssimoes.bsky.social Father, ML, ... 🇧🇷 in 🇬🇧
Also @_lsimoes in the blue-bird-now-letter one. 
Tod Lauer @todlauer.bsky.social Extragalactic astronomer (black holes, galaxies, galaxy clusters, stellar pops) who also dabbles in planetary astronomy. Really, basically a pixel pusher.
astrafoxen @astrafoxen.bsky.social 21 - any pronouns
Astrophysics undergrad student in California (grad '27), aspiring planetary scientist. I do astronomy research on asteroids, comets and TNOs!
pfp by me
banner by Ian Regan
ESO @eso.org The European Southern Observatory designs, builds & operates world-class observatories on the ground for the benefit of society. More info on eso.org