Euclid Consortium

Do you want to get involved in Citizen Science? Here's a fascinating project by scientists from our consortium. This classification project will conclude soon, but there'll be more in the future.

#CitizenScience #astronomy #science #ESA #ESAEuclid #Euclid

Do you want to get involved in Citizen Science? Here's a fascinating project by scientists from our consortium. This classification project will conclude soon, but there'll be more in the future.

#CitizenScience #astronomy #science #ESA #ESAEuclid #Euclid

A field of space with a dozen white foreground stars and a number of small, yellow background galaxies. Credit: NASA, ESA, D. Li (Utoronto), Image Processing: J. DePasquale (STScI)

At left, a field of space with a dozen white foreground stars and a number of small, yellow background galaxies. An unremarkable area at centre is outlined with a dashed circle surrounded by a white box. Lines extend from the box to a pullout at right containing faint, grainy white light surrounded by a circle labeled “Candidate dark galaxy – diffuse emission.” Four white dots are circled in blue and labeled globular clusters. Credit: NASA, ESA, D. Li (Utoronto), Image Processing: J. DePasquale (STScI)

Hubble has joined forces with ESA's Euclid and NAOJ's Subaru Telescope in Hawaii to identify a galaxy that appears to be 99% dark matter!

Read more 👉 www.esa.int/Science_Expl...
🔭🧪

Holiday greeting image showing two large galaxies observed by the Euclid space telescope, a small Euclid sketch, and "Joyful holidays and happy DR1-year 2026".

A happy and peaceful holiday season and a prosperous DR1 new year from @ec-euclid.bsky.social in general and the ELSA team in particular 🔭🧪

To find out more about this image: www.euclid-ec.org/happy-holida...

YouTube video by European Space Agency, ESA Euclid's first deep dive into the Universe

✨ Explore the deep cosmic fields from our Euclid space telescope with this video. 🧪🔭

youtu.be/rXCBFlIpvfQ?...

Holiday greeting image showing two large galaxies observed by the Euclid space telescope, a small Euclid sketch, and "Joyful holidays and happy DR1-year 2026".

We would like to wish everyone joyful holidays and a good start into the Euclid Data Release 1 year 2026.

For more info about the image: www.euclid-ec.org/happy-holida...

#astronomy #ESA #space #galaxies

👍

@philplait.bsky.social

Phil, the text has been written and amended in the Euclid Consortium for our season's greetings, then rewritten and amended by ESA 😃

If you pitch an email to editor@euclid-ec.org then we can get you in touch with Mischa Schirmer, who also composed the image.

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.

🎄 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
🔭

Yannick Mellier Photo Credit: Jean Mouette / CNRS Images

Yannick Mellier, 1958–2025

www.euclid-ec.org/yannick-mell...

#ESAEuclid #astronomy #space #ESA

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.

Yannick Mellier Photo Credit: Jean Mouette / CNRS Images

Yannick Mellier, 1958–2025

www.euclid-ec.org/yannick-mell...

#ESAEuclid #astronomy #space #ESA

The project will of course continue. Yannick's support team, his deputy, the board and its chair, and our contacts at ESA will continue to work to ensure that the mission continues, as he would certainly have wanted.

Sadly,

Francis Bernadeau (EC Deputy Lead) and Marc Sauvage (Chair EC Board)

3/3

Those of us who have been here the longest know how hard he worked to make Euclid a success. He became its embodiment, working tirelessly to ensure its success; we owe him an immense debt of gratitude, and we will surely have the opportunity to reflect in detail on all that we owe him.

2/3

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

Wishing you all a very happy holiday (as and when it starts for you) with this, the best-christmas-card-of-the-year, a gorgeous lino print of the Euclid Space Telescope! @eucliduk.bsky.social 🔭🎄

🙏👩‍🎨: @notverymedieval.bsky.social

Our #ESAEuclid is in @esa.int's "Highlights 2025". We think that's justified 😉

#astronomy #space

Holiday greeting image showing two large galaxies observed by the Euclid space telescope, a small Euclid sketch, and "Joyful holidays and happy DR1-year 2026".

We would like to wish everyone joyful holidays and a good start into the Euclid Data Release 1 year 2026.

For more info about the image: www.euclid-ec.org/happy-holida...

#astronomy #ESA #space #galaxies

➡️ 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 ? 🤨

Artist impression of the Euclid mission in space. The spacecraft is white and gold and consists of three main elements: a flat sunshield, a large cylinder where the light from space will enter, and a 'boxy' bottom containing the instruments. The spacecraft is shown half in the shadow, because the sunshield will always be faced in the direction of the Sun and thus protecting the telescope from the light of the Sun. The background is a realistic representation of a deep field view of the night sky, with many galaxies visible. On the bottom half of the image, an artistic representation of the cosmic web is overlayed over the galaxies. The cosmic web is the scaffolding of the cosmos on which galaxies are built, consisting primarily of dark matter and laced with gas. The cosmic web is here represented with a grid and a two-dimensional representation of a cosmological simulation.

Euclid, our #DarkUniverse 🕵️ detective, is hard at work creating a map of the large-scale structure of the Universe across space and time.

What five mysteries is this detective trying to crack? Find out here 👉 www.esa.int/Science_Expl...

🔭

The #CM25 historic increase of 3.5% per year beyond inflation for Science will enable some of the most imaginative missions in our history and bolster European scientific leadership.

First step: deliver the #CosmicVision missions such as LISA & NewAthena. The next great leap is #Voyage2050 🔭 🧪

Roman Space Telescope's instrument package being moved by a crane inside a cleanroom facility. The package is wrapped in protective silver material and mounted on a large platform.

The nearly complete Nancy Grace Roman Space Telescope has made another set of critical strides toward launch. This fall, the outer portion passed two tests—a shake test and an intense sound blast—to ensure its successful launch: go.nasa.gov/4ooRM2L #NASARoman 🔭 🧪

Our Ministerial Council starts today. Watch the first session live from 12.30 GMT/13.30 CET to know everything about ESA's future roadmap and budget. #CM25

📺 watch.esa.int

More details 👉 www.esa.int/About_Us/Min...

Including our favourite mission, who would have thought, #ESAEuclid 😀

#space #astronomy #cosmology #science #Euclid

The Science Programme is driven by our biggest questions about the Universe and organised into long-term planning cycles.

#CosmicVision, defined in 2004, guides missions into the mid-2030s, such as Juice & Euclid.
#Voyage2050 sets the agenda for the next era of space exploration.

🔭 #CM25 2/

Europe map showcasing the flags of the ESA Member States.

ESA’s Science Programme is the backbone of European space science. We deliver pioneering missions that enable:

✨ discoveries
🤝 collaboration
💡 innovation
🤩 inspiration

impacting ESA across directorates 👉 science.esa.int

Curious how the Science Programme works? This 🧵 is for you

🔭 #CM25 1/

Sky viewing tool with Euclid's Dark Cloud in the infrared on top of a ground-based visible image.

We followed up #ESAEuclid's near-infrared image of the Dark Cloud LDN 1641 with a comparison to the NIR 2MASS survey, and to a bespoke ground-based image in visible light.

Here's the comparison including a tool to experiment yourself:

www.euclid-ec.org/clouds-darkn...

#ESA #space #science 🔭

Lessons from the November 2025 solar storm

Not only #ESAEuclid saw the recent massive solar proton and X-ray outbreaks. Some of @esa.int's other sats actually did science with it:

#astronomy #space

www.esa.int/Space_Safety...

Dis Jamy, quelles peuvent être les conséquences d'une grosse éjection de masse coronale solaire ? 🤓

➡️ Sur Terre : ✨ de jolies aurores ✨

➡️ Sur les instruments d'Euclid : 💩💩💩

Explications, avec des images du satellite de la semaine dernière ! ⬇️ #astro #aurores #science #auroras

The solar flare that caused aurora here on Earth a few days ago, also caused a blizzard of particle impacts on @ec-euclid.bsky.social's detectors. Very nice explainer by @james4cet.bsky.social www.euclid-ec.org/here-comes-t... 🧪🔭