Jean-François Gonzalez
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jfg-astro.bsky.social
Jean-François Gonzalez
@jfg-astro.bsky.social
Astrophysicist at CRAL (Observatoire de Lyon, Université Lyon 1, @ENSdeLyon.bsky.social) | Planet formation 🪐
🐘: @[email protected]
Born at 325ppm CO2
Reposted by Jean-François Gonzalez
THEY CAME FROM OTHER STARS! A new all-ages comic by @makinaro.com and me about 3I/ATLAS, `Oumuamua, and Borisov: why they're exciting, and why they're both familiar and alien at the same time. www.snexplores.org/article/inte...
Interstellar objects: Visitors from other stars! [COMIC]
Only three interstellar objects have ever been spotted. Here’s what we know about them and why they’re so cool.
www.snexplores.org
February 4, 2026 at 3:24 PM
Reposted by Jean-François Gonzalez
It's official. I just took over as the new director of the Laboratoire d'Astrophysique de Bordeaux (@labastrobordeaux)!

It's a whole new gig -- wish me luck!
🚀 Nouveau chapitre au @labastrobordeaux.bsky.social
!
@planetplanet.bsky.social et Benoît Lavraud prennent la direction par intérim
Objectifs : exceller en instrumentation, renforcer la gouvernance et placer l’humain au cœur du labo

To infinity and beyond! 🌌

astrophy.u-bordeaux.fr/transition-a...
January 30, 2026 at 4:07 PM
Reposted by Jean-François Gonzalez
Forgot to actual tag Matt here:
@matt-belyakov.bsky.social
January 30, 2026 at 3:31 PM
Reposted by Jean-François Gonzalez
We signed the agreement for the construction of BlueMUSE, a new instrument for our VLT ✍️

Anticipated to see first-light in 2034, it will enable detailed observations within our galaxy and help study the distant Universe.

https://www.eso.org/public/announcements/ann26001

🔭 🧪
#instrumentation
📷 ESO
January 30, 2026 at 3:05 PM
Reposted by Jean-François Gonzalez
It's paper day!

It turns out the CO ice line promotes the early formation of planetesimals in protoplanetary discs with porous grains.

Because it is fragile, the CO ice coating the grains in the cold outer disc prevents them from growing during collisions.

1/3
January 29, 2026 at 7:19 PM
It's paper day!

It turns out the CO ice line promotes the early formation of planetesimals in protoplanetary discs with porous grains.

Because it is fragile, the CO ice coating the grains in the cold outer disc prevents them from growing during collisions.

1/3
January 29, 2026 at 7:19 PM
Reposted by Jean-François Gonzalez
The power of persistence and community unity! What a great win for #Astronomy

American company (AES Andes) was planning on building an industrial facility in the Atacama desert. This would've produced light pollution affecting the pristine skies where some big telescopes are.

Well .... no more!

🔭
Paranal: Night Sky Secured – A Triumph for the Astronomers’ Protest
The planned industrial facility near ESO Paranal has been halted, ensuring the protection of the unique night sky for astronomical research.
www.mpe.mpg.de
January 27, 2026 at 9:02 PM
Reposted by Jean-François Gonzalez
Les propositions des 72 noms de femmes scientifiques à inscrire sur la tour Eiffel ont été révélées:
buff.ly/uLtmBVr
parmi celles-ci plusieurs astronomes: Edmée Chandon, Louise du Pierry, Dorothéa Klumpke, Lydie Koch.
Bravo pour l'énorme travail de la commission co-présidée par Isabelle Vauglin !
72 noms de femmes de science : les propositions dévoilées
Les propositions de 72 noms de femmes scientifiques à inscrire sur la Tour Eiffel ont été dévoilés ce 26 janvier 2026.
www.toureiffel.paris
January 27, 2026 at 3:21 PM
Reposted by Jean-François Gonzalez
HELLO !
👉 This is une offre de stage 👈
Si vous êtes en M2 ou équivalent et que vous aimez l'optique et/ou les exoplanètes, n'hésitez pas à contacter Mamadou N'Diaye, Simon Prunet et moi-même !
January 26, 2026 at 12:43 PM
Reposted by Jean-François Gonzalez
Un moment de célébration dans une année 2026 jusqu'ici oppressante et mortifère : le méga-projet industriel et portuaire qui menaçait les observatoires internationaux au Chili (VLT, ELT, CTA) semble être annulé, avant la prise de fonction du président d'extrême-droite : www.emol.com/noticias/Eco...
AES Andes desiste de su megaproyecto INNA que enfrentó la resistencia del mundo astronómico y el rechazo de Kast
La iniciativa se iba a ubicar en Taltal, en la Región de Antofagasta.
www.emol.com
January 26, 2026 at 8:23 AM
Reposted by Jean-François Gonzalez
Elles ont été observées au Groenland apparemment !
Aurores boréales au Groenland ...
January 20, 2026 at 6:07 PM
Reposted by Jean-François Gonzalez
Vous aimez la photo ? Vous aimez les montagnes (de toute manière vous n'avez pas le choix hein ??) ? Vous aimez le ciel (idem ???) ? Ce concours est fait pour vous !!!

www.osug.fr/grand-public...

@osug-fr.bsky.social @cnrs.fr
January 8, 2026 at 9:33 AM
Reposted by Jean-François Gonzalez
Reposted by Jean-François Gonzalez
I helped Professor Dave lay out exactly how Avi Loeb has manufactured doubt and pushed a false narrative about 3I/ATLAS, which is still an interstellar comet. Please enjoy the video and please repost this to share the word.
www.youtube.com/watch?v=lf9o...
Avi Loeb is a Fraud Part 2: 3I/ATLAS Shrugged
YouTube video by Professor Dave Explains
www.youtube.com
November 20, 2025 at 11:13 PM
Reposted by Jean-François Gonzalez
PAPER ALERT!!!
OKAY, I’m SUPER EXCITED - our article that we started in 2022 has just been published!
👉 Title: A socio-demographic study of the exoplanet direct imaging community 2
👉 Link: baas.aas.org/pub/2025i028...
👉 Key results: 👇👇👇
A socio-demographic study of the exoplanet direct imaging community II
This article presents results from a 2022 Spirit of Lyot conference survey assessing diversity, visibility, and experiences of inappropriate behavior in the exoplanet imaging community. It reveals per...
baas.aas.org
November 19, 2025 at 1:11 PM
Reposted by Jean-François Gonzalez
ALERTE PAPIER !!!

AYÉ, je suis SUREXCITÉE, notre article démarré en 2022 vient d'être publié !
👉 Titre : A socio-demographic study of the exoplanet direct imaging community 2
👉 Lien : baas.aas.org/pub/2025i028...
👉 Résultats marquants :👇👇👇
A socio-demographic study of the exoplanet direct imaging community II
This article presents results from a 2022 Spirit of Lyot conference survey assessing diversity, visibility, and experiences of inappropriate behavior in the exoplanet imaging community. It reveals per...
baas.aas.org
November 19, 2025 at 12:34 PM
Reposted by Jean-François Gonzalez
Congratulations! Your students know more about comets than Avi Loeb!
This! Here's a slide pulled from my class lecture notes this semester. Comets have two clear tails - one from dust and one from ions. They point in different directions because one feels the solar wind while the other feels radiation pressure.
November 14, 2025 at 4:36 PM
Reposted by Jean-François Gonzalez
Avi Loeb's calculations about 3I/ATLAS are 100% wrong because he has never understood that dust in the tail(s) responds to solar radiation pressure. Solar wind shapes the ion tail. But the radiation pressure is about 1000 times larger than the solar wind ram pressure, for particles that feel it.
November 13, 2025 at 9:36 PM
Reposted by Jean-François Gonzalez
Yes!! Jason Wright, Sean Raymond and I also pointed out 'Oumuamua was stupidly thick, inefficiently reflected mostly red light, and was tumbling and non-functioning. Are aliens terrible engineers? Excellent engineers who make spaceships that LOOK like comets/chunks of ice? I can't disprove that.🤷
Speaking as a spacecraft engineer, the thing that gets me about Loeb's interpretations is that his alien engineers are insultingly incompetent.
RCS thruster plumes visible from the other side of the solar system, making no difference in the trajectory?!
And 'Oumuamua was a *terrible* solar sail.
November 8, 2025 at 7:58 PM
Reposted by Jean-François Gonzalez
New image of interstellar comet 3I/ATLAS by M. Jäger, G. Rhemann & E. Prosperi.
Avi Loeb's: "Is the network of jets associated with pockets of ice on the surface of a natural cometary nucleus or are they coming from a set of jet thrusters used for navigation of a spacecraft? We do not know."
November 8, 2025 at 6:35 PM
Reposted by Jean-François Gonzalez
Rosalind Franklin, la véritable pionnière de ces travaux sur la découverte de la structure en double hélice de l'ADN, est morte en 1958 sans avoir jamais été reconnue comme la scientifique à l'origine des résultats qui ont valu le Nobel à Watson.
💪
⚫ Le prix Nobel américain James Watson, qui révolutionné la science en découvrant la structure de l'ADN avec son collègue Francis Crick, est décédé à l'âge de 97 ans, a annoncé vendredi le Cold Spring Harbor Laboratory (CSHL), avec lequel il a travaillé ⬇️
November 8, 2025 at 8:33 AM
Reposted by Jean-François Gonzalez
Correction : "L'homme qui a volé la découverte de l'ADN à Rosalind Franklin est mort. Il était en outre raciste et homophobe, et prônait la sélection génétique pour appuyer ces idéologies."

Bon débarras.
November 8, 2025 at 6:50 AM
Reposted by Jean-François Gonzalez
👉 OFFRE DE STAGE 👈
J'ouvre un stage orienté SHS pour de l'analyse de données de sondages socio-démographiques !
Les thèmes : l'Inclusion, Diversité & Equité de groupes sous-représentés en astronomie.
N'hésitez pas à m'envoyer un email si ce sujet vous intéresse, ou à le diffuser autour de vous !
October 29, 2025 at 9:35 AM
Reposted by Jean-François Gonzalez
🚨 ALERTE ARTICLE �

"Women participation in French Astronomy 2025", Lagarde et al. 2025, résumé et quelques plots...

👉 La Commission Femmes & Astro de la @sf2a.bsky.social a mené une étude statistique sur la présence des femmes dans l’astronomie professionnelle française 👇👇👇
a blue and red background with a globe in the background
ALT: a blue and red background with a globe in the background
media.tenor.com
October 22, 2025 at 8:23 AM
Reposted by Jean-François Gonzalez
2/ If you want to learn more about 4MOST, head over to the ESO Blog to learn about:

👉 the technical challenges of observing thousands of objects simultaneously
👉 the scientific questions @4most-eu.bsky.social will address

www.eso.org/public/blog/...

🔭 🧪
#instrumentation
ESOblog: The magic behind 4MOST Thousands of eyes to chart the sky
The magic behind 4MOST
www.eso.org
October 21, 2025 at 1:28 PM