Yaël Moussouni

Demon core experiment

roses are red
cherenkov is blue
just use a screwdriver
what's the worst it could do

Ridgeline plot: from bottom to top, succession of lines (filled below them) from black to blue to white, with random bell-curved features and a flat plateau in the center, going to the right toward the top.

same, but in purple.

same, but in yellow.

same, but in grey.

I had fun with #matplotlib before leaving for the weekend

I wanted to do this #matplotart for quite some time, from a galaxy cluster image I'm working with. I blurred and rescaled it, took every ~100 line of pixels from the image, and made ridgeline plots with them.

Why do we do astrophysics? At time of writing, large language models (LLMs) are beginning to obtain the ability to design, execute, write up, and referee scientific projects on the data-science side of astrophysics. What implic...

"Every person is a human being, whose personal development is more important than our short-term scientific accomplishments" - and more bangers in this from David Hogg (spoiler: it's about AI!) arxiv.org/abs/2602.10181 🔭

Panel 1: Some social scientists (five stick figure portraits of scientists) Economist Archaeologist Geographer Psychologist Anthropologist Panel 2: Some antisocial scientists (five stick figures scuttling out of the panel) Introverted Astronomer Solitary Mathematician Reclusive Biologist Misanthropic Chemist Withdrawn Physicist

My cartoon for this week’s @newscientist.com

Comic. [Over dark background, a five-pointed pentagram-style star orbits around a white circle with a smaller orbit.] [caption] Space news: Astronomers have found the first known system with a main-sequence star orbited by a five-pointed one.

Binary Star

xkcd.com/3203/

"Tile 102159776"

C'est le nom barbare donné à cette image d'Euclid, à travers laquelle nous vous proposons de voyager aujourd'hui...

Des dizaines de milliers de photos comme celles-ci seront prises par notre cher satellite, toutes aussi riches et belles que Tile 102159776 ! 🤩

#science #astro

Headline: "Scientists discover emperor penguin colony in Antarctica using satellite images"

Yesterday it was cows using tools, today its penguins using satellite imagery.

Au revoir Yannick!

Dear colleagues and friends,

It is with the greatest sadness that we announce the passing of Yannick Mellier, which occurred during the night between Friday and Saturday. His death leaves a huge void within the consortium and our community.

1/3

#astronomy #space #ESA

Interview de chercheur-ses pour doc radio À l'occasion d'un projet de documentaire radio sur France Culture, je cherche des chercheur-ses représentant une diversité de disciplines mais également de statuts à interviewer. L'idée est de partir...

🚨 Je cherche des chercheur-ses de toutes disciplines pour un doc radio pour parler de leur sujet de recherche mais aussi de leur quotidien (une journée type au labo). Contrainte supplémentaire, le labo doit être hors de Paris.
Plus d'infos : forms.gle/hw9wH2p5UH4A...

Rencontres Euclid-France 2025

L'Observatoire astronomique de Strasbourg a eu le plaisir d'accueillir les Rencontres Euclid-France 2025, avec une journée au Planétarium du Jardin des Sciences où les données Euclid ont été montrées en pleine voûte.

euclidfrance25.sciencesconf.org/program

L’archéologie galactique avec les courants d’étoiles Un spectacle proposé dans le cadre des Echappées inattendues du CNRS : embarquez pour un voyage immersif depuis l’orbite terrestre jusqu’aux confins de la Voie lactée. Découvrez comment les astronomes...

La semaine prochaine, @nfmartin1980.bsky.social et Claire Guillaume feront un spectacle sur l'archéologie galactique avec les courants d’étoiles, au Planétarium du Jardin des Sciences de @unistra.fr, avec les Echappées inattendues @cnrs.fr les 4 et 7/10.
jardin-sciences.unistra.fr/programmatio...

While at CDS, the Aladin project mainly deals with deep sky images, we also map planetary surfaces.

We released the HiPS of China's Tianwen-1 MoRIC images, a true-color map of Mars at 76m resolution.

Interact with this awesome dataset in Aladin Lite at alasky.cds.unistra.fr/Planets/CDS_...

Le Planétarium, un outil pour la projection de données scientifiques Unique planétarium universitaire en France, le Planétarium du Jardin des Sciences de l'Université de Strasbourg entretient un lien direct avec la recherche scientifique. Ses équipes travaillent notamm...

Un petit reportage pour en savoir un peu plus sur l'usage des données du CDS @cdsportal.bsky.social au Planétarium :
savoirs.unistra.fr/eclairage/le...

A photo of the slide with the December 2026 release date

Finding out about Gaia at #EAS2025Cork! ☄️

Just announced: Gaia DR4 will be released in December 2026!

If we manage to work well together, we get to learn a little bit about it

I frequently take comfort in the fact that the Universe is vast and beautiful and entirely unaffected by petty human foolishness

A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. The image focuses on a collection of interacting galaxies connected by delicate streams of stars. At top center lies a large elliptical galaxy that is dense and smooth, like a polished stone glowing with golden light. Like delicate spider silk or stretched taffy, these stellar bridges link the large elliptical to the few larger galaxies beneath, evidence of past collisions. All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black.

A cosmic tapestry of glowing tan and pink gas clouds with dark dust lanes. In the upper right, the Trifid Nebula resembles a small flower in space. Its soft, pinkish gas petals are surrounded by blue gas, and streaked with dark, finger-like veins of dust that divide it into three parts. It radiates a gentle, misty glow, diffuse and soft like the warmth of breath on a cold hand. To the lower left, the much larger Lagoon Nebula stretches wide like a churning sea of magenta gas, with bright blue, knotted clumps sprinkled throughout where new stars are born. Both nebulae are embedded in a soft tan backdrop of gas that is brighter on the left than on the right, etched with dark tendrils of dust and sprinkled with the pinpricks of millions of stars.

A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. To the lower left is a region filled with the hundreds of golden glittering gems of a distant galaxy cluster. In the foreground, below and right of center, two blue spiral galaxies look like eyes beneath the entangled mass of a triple galaxy merger in the upper right. A few bright blue points of foreground stars pierce the glittering tapestry. All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black.

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 a MSc (soon PhD) student in Astrophysics, working on extragalactic globular clusters and their stellar populations. I would like to be able to share my work here.

yes

@bot.astronomy.blue signup

An xkcd cartoon titled “Typical exoplanet system”. There’s a drawing of a star and several weird planets orbiting around it. The planets are labeled as follows: Giant planet orbiting so close that it’s actually rolling on the star’s surface. Hot Jupiter. Mini Neptune. Planet that could be habitable, if there’s a form of life that hates water but loves acid and being on fire. Cold Jupiter. Potentially habitable void. Hot Mars. Planet that may actually be in the habitable zone, according to a very optimistic modelling paper by some desperate postdocs. There’s a pulsar here but it’s probably fine. A water world paradise with beautiful oceans and warm- wait, no, we just got new measurements, it’s a hellish steam oven. Mini Pluto. Lukewarm Jupiter. Earthlike data artifact. Planet whose atmosphere is confirmed to contain atoms. Wet Saturn. Either a gas giant or a fist-sized rock, depending which calibration method you use. Faint dust cloud that will cause several papers to be retracted. Somehow this whole system is smaller than the orbit of Mercury?! Planet whose surface may host conditions suitable for rocks. Mouseover text: Sure, this exoplanet we discovered may seem hostile to life, but our calculations suggest it’s actually in the accretion disc’s habitable zone.

New exoplanet classification just dropped 🔭🧪

xkcd.com/3103/

Signez la pétition Sauvons le Palais de la découverte

🔴 Sauvons le Palais de la découverte !

Le Palais est en danger, menacé d’expulsion. Signez et partagez cette pétition au plus grand nombre pour préserver ce haut lieu des sciences à Paris ⤵️

www.change.org/p/sauvons-le...

I recently moved my Mastodon account (@ial_2@social.sciences.re) and decided to create this BlueSky account instead of using a bridge. From now, I will post on both platforms, in English or in French

Finally, in my free time, I like taking pictures of birds (among other things), playing organ and guitar, climbing, and I used to fly gliders.

#Introduction:
I'm Yaël Moussouni, a #MSc student (and #PhD student from October) in #astrophysics at Strasbourg, working on extra-galactic globular clusters and their stellar populations (with @karinavoggel.bsky.social and Ariane Lançon)

I'm also involved in #astronomy outreach during summers.

Je travail principalement sur les amas globulaires extragalactiques et leurs populations d'étoiles avec @karinavoggel.bsky.social et Ariane Lançon.

Je suis aussi impliqué dans la médiation scientifique...
(2/4)

Il est temps de faire une #introduction! (Version en anglais au dessus)

Je suis Yaël Moussouni, actuellement étudiant en #master (et #doctorant à partir d'octobre) à l'Observatoire astronomique de Strasbourg (@obsstrasbourg.bsky.social). (1/4)

I recently moved my Mastodon account (@ial_2@sciences.re) and thought that I should also make a BlueSky account in addition to interact with everyone here, instead of using a bridge, so from now I will post and interact on both platforms! I may post in English or French... (4/4)

Finally, in my free time, I like taking pictures of birds (among other things), playing organ and guitar, climbing, and I used to fly gliders. (3/4)

I'm working primarily on extragalactic globular clusters and their stellar population, with @karinavoggel.bsky.social and Ariane Lançon.

I'm also involved in #astronomy outreach as a scientific animator at the Centre Astro de St.-Michel-l'Observatoire during the summer. (2/4)