Institut d'astrophysique de Paris
LightNews LightNews
banner
iap.fr
Institut d'astrophysique de Paris
@iap.fr
730 followers 110 following 58 posts
Compte officiel de l'Institut d'astrophysique de Paris (IAP), une unité mixte de recherche du CNRS et de Sorbonne Université. #HelloESR

http://www.iap.fr/
Posts Replies Media Videos
Reposted by Institut d'astrophysique de Paris
science.esa.int
🎄 Are your holiday decorations ready? Euclid has a cosmic garland to add: NGC 646.

The large barred spiral galaxy appears close to a smaller galaxy to the left, but they’re actually about 45 million light-years apart 👉 https://www.esa.int/ESA_Multimedia/Images/2025/12/Euclid_s_galaxy_garland
🔭
An image of space made by the Euclid telescope shows a bright barred spiral galaxywith two sweeping arms glowing in shades of blue and white against a deep black background dotted with stars. Its core is luminous. Its spiral arms curve gracefully outward to the left and down to the right, resembling a cosmic garland draped across the scene. A smaller, faint and round galaxy appears to the left of the barred spiral galaxy.
December 22, 2025 at 1:10 PM
Reposted by Institut d'astrophysique de Paris
astroroyalscot.bsky.social
On this darkest solstice day of the year, my heart has dimmed, waking up to learn of the loss of dear colleague and mentor, Yannick Mellier. Yannick will be known to most as the lead of the amazing Euclid Space Telescope which will revolutionise our understanding of the Dark Universe 🧵🔭
Yannick Mellier looking very dapper in tan suit and maroon shirt, arms raised, enthusiastically explaining something in a lecture theatre. This square astronomical image shows thousands of galaxies across the black expanse of space. The closest thousand or so galaxies belong to the Perseus Cluster. The most prominent members of the cluster are visible in the centre of the image and appear as large galaxies with haloes around them in yellow/white, comparable to streetlamps in a foggy night. The background of this image is scattered with a hundred thousand more distant galaxies of different shapes, ranging in colour from white to yellow to red. Most galaxies are so far away they appear as single points of light. The more distant a galaxy is, the redder it appears.] CREDIT ESA/Euclid/Euclid Consortium/NASA, image processing by J.-C. Cuillandre (CEA Paris-Saclay), G. Anselmi
December 21, 2025 at 8:45 AM
iap.fr
It is with great sadness that we announce the passing of our colleague Yannick Mellier. Yannick was an eminent astronomer, an international figure in modern cosmology, founder and director of TERAPIX from 1997 to 2011, and Consortium Lead of the Euclid space mission since 2011.
A black-and-white photograph of Yannick Mellier, taken in 2009 by Jean Mouette, on the occasion of his CNRS silver medal award.
December 22, 2025 at 10:16 AM
iap.fr
C’est avec une très grande tristesse que nous vous annonçons le décès de notre collègue Yannick Mellier. Yannick était un astronome éminent, figure internationale de la cosmologie moderne, fondateur et directeur de TERAPIX de 1997 à 2011, Consortium Lead de la mission spatiale Euclid depuis 2011.
Une photographie en noir et blanc de Yannick Mellier, prise en 2009 par Jean Mouette, à l'occasion de sa médaille d'argent du CNRS.
December 22, 2025 at 10:12 AM
Reposted by Institut d'astrophysique de Paris
euclid-france.bsky.social
C'est avec une immense tristesse que nous vous informons du décès de Yannick Mellier, Directeur du Consortium scientifique Euclid.

Yannick dirigeait la mission depuis 2011.
December 21, 2025 at 4:17 PM
Reposted by Institut d'astrophysique de Paris
euclid-france.bsky.social
🎉 Très belles vacances à tous et bonne année 2026 ! 🥳

Cette année sera celle de la première "grosse" publication de données du satellite (DR1), en octobre, et des premiers résultats cosmologiques de la mission ! 🌌

Crédit : ... ⬇️

#science #astro #astronomy #astrophoto #Holidays #2026
December 19, 2025 at 10:04 AM
Reposted by Institut d'astrophysique de Paris
science.esa.int
🐣 Found: newborn stars and planets

#ESAGaia & ALMA joined forces to study 31 baby star systems, finding hints of planets 👉 www.esa.int/ESA_Multimed...

The collage also shows our own Solar System for reference on the bottom right, as it is predicted to have looked at an age of 1 million years. 🔭 🧪
A collage of 32 glowing discs on a black background. Each disc shows concentric rings in vivid colours: purple, orange, and yellow, with bright cyan centres. The discs vary in size and orientation, creating a striking pattern of circular and elliptical shapes.
December 18, 2025 at 9:04 AM
iap.fr
@iap.fr a fait peau neuve de multiples façons cette année, pour encore mieux explorer en 2026 : les exoplanètes, les galaxies proches, lointaines, et leurs constituants sereins ou violents, les confins et l'aube de l'Univers...
@cnrs-insu.bsky.social @cnrs-paris.bsky.social @sorbonne-universite.fr
December 18, 2025 at 11:42 AM
iap.fr
@iap.fr has undergone a few makeovers this year, to explore further in 2026: exoplanets, nearby and distant galaxies, their serene and violent components, the frontiers and dawn of the Universe...
December 18, 2025 at 11:42 AM
Reposted by Institut d'astrophysique de Paris
stsci.edu
Dr. Nancy Grace Roman is known as the "mother of Hubble." She was the first female executive at NASA and became the first Chief of Astronomy. The telescope named in her honor will launch by May 2027. 🔭
It's very important that you pursue that dream to devote your life to studying the cosmos #shorts
YouTube video by Space Telescope Science Institute
youtube.com
December 15, 2025 at 6:57 PM
Reposted by Institut d'astrophysique de Paris
sf2a.bsky.social
Conference The Extragalactic Transient Universe, 6-10 July, 2026, Marseille (France)
Extragalactic Transient Universe. 17th edition of the Marseille Galaxy and Cosmology Conference series. - Sciencesconf.org
Meeting Description
buff.ly
December 16, 2025 at 8:03 AM
Reposted by Institut d'astrophysique de Paris
cnrs.fr
Le CNRS a proposé au Sénat des mesures fortes pour renforcer la place des femmes en science. Cette sous-représentation n’est pas une fatalité : elle résulte de biais, de stéréotypes, d’inégalités et de violences tout au long des parcours scolaires et professionnels.
Féminiser les sciences : comment réparer le « tuyau percé » | CNRS
À l’automne 2025, un rapport déposé au Sénat auquel le CNRS a contribué a proposé plusieurs mesures fortes pour attirer et consolider les effectifs féminins d
www.cnrs.fr
December 16, 2025 at 9:22 AM
Reposted by Institut d'astrophysique de Paris
sf2a.bsky.social
Dans le cadre des journées de la SF2A 2026 organisées à Grenoble, du 22 au 26 juin 2026, l’OSUG et l’IPAG organisent le concours photographique “Des montagnes au ciel étoilé” ouvert à tous, dont les photographies lauréates feront l’objet d’une exposition itinérante.
Concours photographique « Des montagnes au ciel étoilé » - OSUG, Observatoire des Sciences de l’Univers de Grenoble
L’OSUG et l’Institut de Planétologie et d’Astrophysique de Grenoble (IPAG) organisent le concours photographique « Des montagnes au ciel étoilé », dont les (…)
buff.ly
December 15, 2025 at 8:02 AM
Reposted by Institut d'astrophysique de Paris
cea.fr
#Univers🌌| La supernova la + lointaine jamais observée ?

Le satellite franco-chinois SVOM a détecté un sursaut gamma survenu seulement 630 millions d’années après le Big Bang (z ≃ 7,3), l’un des + lointains jamais identifiés. Son nom ? GRB 250314A.

Plus d'infos 👉 bit.ly/4psaojL
Svom détecte l’un des sursauts les plus lointain de l’Univers et permet d’observer la supernova la plus lointaine jamais détectée
Le 14 mars 2025, le satellite franco-chinois SVOM (Space-based multi-band astronomical Variable Objects Monitor) a détecté un sursaut gamma exceptionnel, baptisé GRB 250314A, provenant des confins de ...
bit.ly
December 9, 2025 at 3:40 PM
Reposted by Institut d'astrophysique de Paris
euclid-france.bsky.social
➡️ COMMENT VOIR L'INVISIBLE ? ✨

Vous avez certainement vu passer cette magnifique image de la nébuleuse LDN 1641, également nommée "Dark cloud", publiée par @esa.int @fr.esa.int et @ec-euclid.bsky.social il y a peu.

Mais pourquoi ce "nuage sombre" s'appelle-t-il ainsi ? 🤨
December 15, 2025 at 1:00 PM
Reposted by Institut d'astrophysique de Paris
science.esa.int
How will LISA capture gravitational waves?

When two black holes orbit each other, heading for a collision, they shake the fabric of space-time. The ripples alter the distance between objects.

LISA will use laser beams between 3️⃣ spacecraft that house free-floating cubes to detect these changes.
Infographic providing information on gravitational waves and how the LISA mission will measure them using laser beams and free-floating cubes. The image shows the three LISA spacecraft in orbit with the Earth and Sun visible. A zoomed in circle focuses on one of the spacecraft and the two golden cubes it contains. In the background an illustration of two colliding black holes is creating ripples in spacetime. Another box shows a sequence of triangles to demonstrate the effect gravitational waves will have on the distance travelled by LISA’s laser beams.
December 12, 2025 at 10:00 AM
Reposted by Institut d'astrophysique de Paris
francoislevrier.bsky.social
Je donne depuis quelques années un cours de M2 consacré au milieu interstellaire et à la formation des étoiles. Hier matin avait lieu la première des sept séances pour 2025-2026, et je me suis dit que c'était l'occasion de faire un peu de vulgarisation sur ces thématiques.
December 12, 2025 at 10:07 AM
Reposted by Institut d'astrophysique de Paris
sptelescope.bsky.social
New results showing constraints on cosmic inflation using the latest CMB & BAO data sets, including SPT-3G temperature and polarization power spectra from this year! Also with public likelihood on Github! arxiv.org/abs/2512.10613 @NSF @doescience
December 12, 2025 at 1:50 PM
Reposted by Institut d'astrophysique de Paris
francoislevrier.bsky.social
Annie Jump Cannon was born #OTD in 1863. A member of the « Harvard computers », she manually classified more stars than anyone else (around 350000), and the classification scheme she devised is the base of the one still in use.
en.wikipedia.org/wiki/Annie_J...
December 11, 2025 at 5:40 AM
Reposted by Institut d'astrophysique de Paris
science.esa.int
Webb breaks its own record by identifying the earliest supernova to date, a star that exploded when the Universe was only 730 million years old.

To astronomers' surprise, this early supernova looks exactly like modern supernovae based on data gathered so far 👉 www.esa.int/Science_Expl...

🔭🧪
Webb image shows hundreds of galaxies of all shapes and sizes against the black background of space. Toward the center-left is a large white spiral galaxy that is almost face-on. To the right of this is a large box, which zooms in on an area at top right. Within the box is a faint red dot at the center, with the label GRB 250314A.
December 9, 2025 at 4:05 PM
Reposted by Institut d'astrophysique de Paris
cnrs.fr
#EnDirectDesLabos 🔎 Nouvelles actualités scientifiques 🔬, création de laboratoires 👨‍🔬, annonce de prix 🏅... Retrouvez toutes les deux semaines les informations issues des laboratoires du CNRS.

👉 www.cnrs.fr/endirectdesl...
December 10, 2025 at 10:49 AM
Reposted by Institut d'astrophysique de Paris
eso.org
We are continuing to expand our efforts to protect the night skies.

ESO signed an agreement with the IAU's Centre for the Protection of the Dark and Quiet Sky to become a contributing partner.
https://www.eso.org/public/announcements/ann25010/

🔭 🧪
📷 A. Daniels (SKAO)
ESO Director General Xavier Barcons (left) and Piero Benvenuti (right), IAU CPS Director, shake hands after signing an agreement. Posters of ESO and the International Astronomy Union’s Centre for the Protection of the Dark and Quiet Sky are visible behind them.
December 10, 2025 at 1:11 PM
Reposted by Institut d'astrophysique de Paris
esa.int
🆕 XMM-Newton & XRISM observed an extraordinary blast from a supermassive black hole 💥🧪🔭

They spotted a bright X-ray flare erupting from the gigantic black hole lurking within NGC 3783. 👉 www.esa.int/Science_Expl...

@science.esa.int
This artist's impression depicts the supermassive black hole of NGC 3783. A gold-to-brown swirling disc surrounds a black ellipse-shaped area that looks like a hole in space. On the right, two very bright white spots atop the disc are connected by an arch of shining lines. From the blazing spot in the foreground, white-to-orange straight lines erupt like jets, reaching the top of the image.
December 9, 2025 at 8:59 AM
Reposted by Institut d'astrophysique de Paris
usngo.bsky.social
Astronomers detected the longest-ever gamma-ray burst (GRB)! These usually last ~minutes, but GRB 250702B lasted over 7 hours. With data from the Gemini South and Blanco Telescopes, scientists are working to determine its origin. noirlab.edu/public/news/... #astronomy
NOIRLab/NSF/AURA/M. Garlick
Gemini and Blanco Telescopes Unlock Clues to Origin of Longest Gamma-ray Burst Ever Observed - Data acquired with multiple NSF NOIRLab facilities indicate gamma-ray burst lasting over seven hours resi...
Astronomers have observed the longest-ever gamma-ray burst — a powerful, extragalactic explosion that lasted over seven hours. Rapid follow-up observations with the U.S. Department of Energy-fabricate...
noirlab.edu
December 8, 2025 at 6:32 PM
Reposted by Institut d'astrophysique de Paris
lemonde.fr
Le satellite franco-chinois SVOM détecte les traces de la plus vieille supernova jamais observée
Le satellite franco-chinois SVOM détecte les traces de la plus vieille supernova jamais observée
Un sursaut gamma, repéré en mars par les instruments du satellite, a permis aux télescopes au sol d’observer rapidement son origine, située à près de 30 milliards d’années-lumière de la Terre.
www.lemonde.fr
December 9, 2025 at 8:22 AM