Famous #exoplanet K2-18 b: is it a super-Earth, a sub-Neptune, or something else entirely? 🌍🌔☁️🪐 The secret of its interior lies in its exterior... the atmosphere! Hear more from Shang-Min (Shami) Tsai's #RockyWorldsDiscussion on Thu 7 May @ 13:00 UTC! More: www.rockyworlds.org/event-detail... 🧪🔭

📢 Join us live in ~1.5 hours! 13:00 UTC = 15:00 CEST = 09:00 EDT = 06:00 PDT = 22:00 JST If you haven't signed up to our mailing list to access the Zoom-link, you can also watch it live on our YouTube channel 🔭☄️🧪 Livestream: www.youtube.com/watch?v=VlQw...

Don't judge a planet by its cover! 📖🪐 Join our next #RockyWorldsDiscussion online tomorrow on Thu 2 April at 13:00 UTC where Ana-Catalina Plesa from DLR will discuss how we can link models of rocky planet interiors to observations of their surfaces 🌋 More: www.rockyworlds.org/event-detail... 🧪🔭

📢 Less than 1 hour left until this talk begins! 14:00 UTC = 15:00 CET = 09:00 EST = 06:00 PST = 23:00 JST If you haven't signed up to our mailing list to access the Zoom-link, you can also watch it live on our YouTube channel 🔭☄️🧪 Livestream: www.youtube.com/watch?v=058C...

You've maybe heard of ocean planets 🌊🪐 but what about *electric magma* ocean planets?! 🔥⚡🌋 For our next #RockyWorldsDiscussion on Thu 5 March @ 14:00 UTC, Miki Nakajima will present exciting simulations on magma ocean dynamos in Earth and super-Earths More: www.rockyworlds.org/event-detail... 🧪🔭

📢 Less than 1 hour left until this talk begins! 14:00 UTC = 15:00 CET = 09:00 EST = 06:00 PST = 23:00 JST If you haven't signed up to our mailing list to access the Zoom-link, you can also watch it live on our YouTube channel 🔭☄️🧪 Livestream: www.youtube.com/watch?v=6t9B...

Would you dare to stand up against the wrath of a star?! Brave little Venus does... and still has an atmosphere! ☀️💨🪐🧲 Next #RockyWorldsDiscussion on Thu 5 Feb @ 14:00 UTC features Moa Persson on "Venus: Defying the Solar Wind Without a Magnetic Shield" More: www.rockyworlds.org/event-detail... 🧪🔭

A HUGE thank you to all attendees of the #RockyWorlds4 conference in Groningen! We had an absolutely incredible time talking astronomy, geoscience, biology, and so much more 🚀🌋🌱🪐✨🔭🧪 Catch the recorded talks on www.youtube.com/@rockyworlds And see you in Berlin in 2028! berlin2028.rockyworlds.org

Had a great time at #RockyWorlds4 this week - presenting my PhD work on magnetic field generation in planetesimals 🧲 and learning lots about magma oceans 🔥ready for my post doc project. Thanks to everyone for such great discussions and @rockyworlds.bsky.social for organising a fantastic meeting!

🌍 Astronomers from all over the world are coming to Groningen for the #RockyWorlds4 conference. 'We would like to broaden the ideas about what a rocky planet could be made up of,' says Inga Kamp, astrophysicist @rug.nl. Curious? Read more 👇 🔗 www.rug.nl/fse/news/mat... 🧪 #SciComm

Poster discussions at #RockyWorlds4 has been amazing! Coffee breaks are on 🔥🔥🔥Super creative posters with incredible science, I think we are improving as a community to communicate our research to other colleagues 🧐 Looking forward for the poster competition ✨ @rockyworlds.bsky.social

Another cool result shared at #RockyWorlds4: Nearly all sub-Neptunes, if they are gas dwarfs (as opposed to water worlds), should have magma oceans beneath their hydrogen atmospheres. That includes the notorious K2-18b — if it is indeed a gas dwarf and not an ocean planet. Preprint:

Looks like Planet Earth is a fan of #RockyWorlds4 as it gifted us with a gorgeous conference souvenir last night! 🤩🔭🧪

You're welcome! 🔭😊 The LOC of #RockyWorlds4 (groningen2026.rockyworlds.org/organisers/loc) is doing everything they can to make the conference an unforgettable experience. 😁

Frankie mouse made it to Groningen. Coming to #RockyWorlds4 tomorrow! And check out Magrathea for your MR relationship or planet composition needs: github.com/Huang-CL/Mag... v2 live now and v3 already on the horizon

First results from the Lava Lamps survey hunting for atmospheres on lava planets shared at #RockyWorlds4: It looks like there could be some kind of transition in the way lava planets redistribute heat around ~2500 K, which could indicate that the very hottest worlds have atmospheres. Mysterious!

I'm excited to spend the week hearing and talking about rocky worlds! This is one of my favorite meeting series, I leave energized and with new ideas. 😁 You can follow along with the talks on YouTube if you aren't joining us in person or on Zoom: www.youtube.com/@rockyworlds...

@johannateske.bsky.social's #RockyWorlds4 talk on TOI-561 b just reinforces my feeling that this weird little planet is one to keep an eye on. It's among a handful of hot rocks challenging what we think we know about which planets have air. I wrote about this last year for @sciam.bsky.social:

Really enjoyed this awesome poster at #RockyWorlds4 by William Brilliant about @terrahunting.bsky.social — can’t believe we are so close to starting our hunt for Earth-like #exoplanets in our cosmic neighbourhood!! 🤩🌍🔭

My visit to #RockyWorlds4 kicked off with a hot take from @nplinnspace.bsky.social's poster: Even in the best-case scenario, we couldn't tell how "Earth-like" an Earth-like planet is 🔥 She assumed TRAPPIST-1 e had Earth-like air and showed that vastly different climates would be indistinguishable.

At #RockyWorlds4 in Groningen, scientists explore rocky planets with radically different chemistries and atmospheres. With the LIFE mission, they aim to study exoplanets directly and look for unexpected signs of life — not aliens, but subtle atmospheric clues. Read more: www.rug.nl/fse/news/mat...

Hello #RockyWorlds4! I'm Elise, a science journalist here hunting for awesome science stories about planets. I'm cool, I promise — I used to be a scientist so I might even understand your science jargon 🤓Come say hi and tell me about your work!

Wondering why we've been so quiet this month? That's because we're busy preparing to welcome everyone *next week* to Groningen 🇳🇱 for... 🌋✨🚀 The ROCKY WORLDS 4 Conference 2026! 🪐✨☄️ Updates will be posted throughout the week from this account & others using the #RockyWorlds4 hashtag – stay tuned! 🔭🧪

📢 Don't forget to join us for this talk tomorrow (Thursday)! 14:00 UTC = 15:00 CET = 09:00 EST = 06:00 PST = 23:00 JST If you haven't signed up to our mailing list to access the Zoom-link, you can also watch it live on our YouTube channel 🔭☄️🧪 Livestream: www.youtube.com/watch?v=e2jI...

6,000 #exoplanets have been found to date, but ZERO of them are Earth-like planets around Sun-like stars! Why is that? Do any exist? Or is it just hard? ☀️🌍🔭 Join us on Thu 4 Dec @ 14:00 UTC for a #RockyWorldsDiscussion with Annelies Mortier to find out! More: www.rockyworlds.org/event-detail... ☄️🧪

📢 Don't forget to join us for this talk tomorrow (Thursday)! 14:00 UTC = 15:00 CET = 09:00 EST = 06:00 PST = 23:00 JST If you haven't signed up to our mailing list to access the Zoom-link, you can also watch it live on our YouTube channel 🔭☄️🧪 Livestream: www.youtube.com/watch?v=6u7P...

What sets our home planet 🌍 apart from our sister next door? 🌔☁️🔥 On Thu 6 Nov @ 14:00 UTC, Diogo Lourenço will be our next #RockyWorldsDiscussion speaker and tell us how bulk composition & lava flows impact long-term evolution of our neighbour Venus More: www.rockyworlds.org/event-detail... 🧪🔭☄️

📢 Don't forget to join us for this talk tomorrow (Thursday)! 13:00 UTC = 15:00 CEST = 09:00 EDT = 06:00 PDT = 22:00 JST If you haven't signed up to our mailing list to access the Zoom-link, you can also watch it live on our YouTube channel 🔭☄️🧪 #exoplanet livestream: www.youtube.com/watch?v=nMr2...

Cloudy with a chance of... haze? Aerosol? Carbon dioxide?!🌦️ Next #RockyWorldsDiscussion on Thu 2 Oct @ 13:00 UTC will feature Kazumasa Ohno (NAOJ) and recent JWST results that lift the hazy veil on the composition of sub-Neptune #exoplanet GJ 1214 b 🪐🔭🧪 More: www.rockyworlds.org/event-detail...

🗣️ Reminder: abstract submission for the Rocky Worlds 4 conference closes **Sunday 14 September** Submit your abstract below and see you in Groningen in January 2026! 🪐🔭🧪

📢 Reminder: this talk is happening later TODAY (Thursday)! Sign up to our mailing list to access the Zoom-link, or watch it live on our YouTube channel 🔭☄️🧪 www.youtube.com/watch?v=uoef... 16:00 UTC = 18:00 CEST = 12:00 EDT = 09:00 PDT = 01:00 (+1d) JST = 02:00 (+1d) AEST

#RockyWorldsDiscussion is back from our summer break! 🔭🧪 Our next speaker is Laura Schaefer from Stanford University, who will tell us about redox gradients in planet formation simulations of terrestrial planets 🌍🌕🪨 Join us on Zoom on Thu 4 Sep @ 16:00 UTC More: www.rockyworlds.org/event-detail...

Happening now! 🪐☄️🔭🧪 www.youtube.com/watch?v=OSSL...

The formation of sub-Neptunes is a steamy topic – literally! 😶‍🌫️ Remo Burn from MPIA will present "Between Steam and Stone: The Role of Volatile Delivery, Phase, & Partitioning in Setting Planetary Radii" on Thu 3 July @ 13:00 UTC 🪐☄️🔭 🧪 #RockyWorldsDiscussion More: www.rockyworlds.org/event-detail...

📣 Calling all rocky enthusiasts! We are thrilled to announce that the ROCKY WORLDS 4 Conference will take place 19-23 Jan 2026 in Groningen, NL 🇳🇱 This is the 4th Meeting in our series & we can't wait to see you there! Abstract submission is NOW OPEN groningen2026.rockyworlds.org/groningen-2026 🪐☄️🔭

📢 Don't forget to join us for this talk tomorrow (Thursday)! 13:00 UTC = 15:00 CEST = 09:00 EDT = 06:00 PDT = 22:00 JST If you haven't signed up to our mailing list to access the Zoom-link, you can also watch it live on our YouTube channel 🔭☄️🧪 #exoplanet livestream: www.youtube.com/watch?v=nA1L...

Machine learning 🤖 + spectrometry 🧪 = astrobiology? 🌱🪐☄️🔭 Michael Wong @miquai.bsky.social & Anirudh Prabhu @anirudhprabhu.bsky.social of Carnegie EPL will discuss new biosignature detection methods at the next #RockyWorldsDiscussion Thu 5 June @ 13:00 UTC! More: www.rockyworlds.org/event-detail...

📢 Starting in ~10 minutes! If you haven't signed up to our mailing list to access the Zoom-link, you can also watch it live on our YouTube channel 🔭☄️🧪 #exoplanet livestream: www.youtube.com/watch?v=Q_or...

What shapes the chemical environment of growing baby #exoplanets? 🧪🔭☄️ At the next #RockyWorldsDiscussion, we will hear Sebastiaan Krijt from @exeter.ac.uk tell us about planet formation with ALMA & JWST – join us on Thu 1 May @ 13:00 UTC on Zoom and YouTube More: www.rockyworlds.org/event-detail...

📢 ~1 hour left until this talk! Sign up to our mailing list to access the Zoom-link, or watch it live on our YouTube channel 🔭🪐🧪

Ever wonder what it'd be like on a planet hot enough to vaporize rock?🔥 Our next #RockyWorldsDiscussion speaker is Lisa Dang @astrolisadang.bsky.social who will present surface & atmosphere mapping of a lava #exoplanet on Thu 3 Apr @ 14:00 UTC on Zoom 🧪🔭☄️ More: www.rockyworlds.org/event-detail...

📢 Reminder: this talk is happening later TODAY (Thursday)! Sign up to our mailing list to access the Zoom-link, or watch it live on our YouTube channel 🔭☄️🧪 16:00 UTC = 17:00 CET = 11:00 EST = 08:00 PST = 01:00 (+1d) JST

Tides? Volcanism? Magnetospheres?! Everyone’s favourite Jupiter moon Io has it all!🌋🧲🌊 On Thu 6 Mar @ 16:00 UTC on Zoom, Katherine de Kleer from @caltech.edu will tell us about Io's tidally-driven volcanism & mass loss at the next #RockyWorldsDiscussion 🧪🔭 More: www.rockyworlds.org/event-detail...

📢 Reminder: this exciting Venus-talk is happening in 2 days (Thursday)! Sign up to our mailing list to access the Zoom-link, or watch it live on our YouTube channel 🔭🪐🧪 14:00 UTC = 15:00 CET = 09:00 EST = 06:00 PST = 23:00 JST

Whatever happened to Venus?! 🪐☁️🔥 Join us for the next #RockyWorldsDiscussion on Thu 6 Feb @ 14:00 UTC (on Zoom) to hear Michael Way tell us about the climate history of our toasty neighbour Venus and recent work reanalyzing in-situ data from Pioneer Venus 🛰️ More: www.rockyworlds.org/event-detail...

The new date for Katherine de Kleer's talk on "Tidally-driven volcanism and mass loss at Jupiter’s moon Io" is March 6! More info: www.rockyworlds.org/event-detail... 🌋🪐🔭

We regret to announce that tomorrow's talk (below) has been postponed due to the ongoing wildfires in the Los Angeles area where our speaker is located. We will share updates on the rescheduled date as soon as possible. Stay safe #LAFire #LAfires

Tides? Volcanism? Magnetospheres?! Everyone’s favourite Jupiter moon Io has it all! 🌋🧲🌊 On Thu 9 Jan @ 16:00 UTC on Zoom, Katherine de Kleer from @caltech.edu will tell us about Io's tidally-driven volcanism & mass loss at the next #RockyWorldsDiscussion More: www.rockyworlds.org/event-detail...

🔭🪐 Don't miss out on joining us for this talk later today (Thursday)! 16:00 UTC = 17:00 CET = 11:00 EST = 08:00 PST = 01:00 JST

Habitable zone planets around M-dwarfs: do they end up as airless rocks or do they retain atmospheres? 🌥️🪨 Join us Thu 5 Dec @ 16:00 UTC on Zoom for a #RockyWorldsDiscussion with Joshua Krissansen–Totton talking about TRAPPIST-1, models, & more! www.rockyworlds.org/event-detail... 🧪🪐🔭