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ELSA: Euclid Legacy Science Advanced analysis tools

@elsa-euclid.bsky.social
575 followers 133 following 107 posts

Pushing the boundaries of spectroscopy with the European Space Agency's Euclid space telescope. Account run by @stephenserjeant.bsky.social and the ELSA team elsa-euclid.github.io

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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 02/10/2026
Also on ELSA #PaperDay, the ELSA work by Jurgen Popp featured in the @royalastrosoc.bsky.social's third Specialist Discussion Meeting on Machine learning and artificial intelligence applied to astronomy. Meeting summary: doi.org/10.1093/astr...
doi.org
Machine learning and artificial intelligence applied to astronomy 3
Report from the Specialist Discussion Meeting Machine learning and artificial intelligence applied to astronomy 3
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 02/10/2026
Also on ELSA #PaperDay we'd like to highlight our latest ELSA @ec-euclid.bsky.social citizen science project, Artifact InSPECtor. Would you like to rummage space telescope data? 🔭🧪 www.zooniverse.org/projects/art...
zooniverse.org
Artifact InSPECtor | Zooniverse - People-powered research
Help us identify image artifacts in space telescope data!
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 02/10/2026
Also for ELSA #PaperDay : check out the AstronomicAL data mining tool from Grant Stevens github.com/grant-m-s/As... - an interactive, plugin-based platform for exploring, labelling, integrating, and modelling scientific data
github.com
GitHub - grant-m-s/AstronomicAL: An interactive, plugin-based platform for exploring, labelling, integrating, and modelling scientific data
An interactive, plugin-based platform for exploring, labelling, integrating, and modelling scientific data - grant-m-s/AstronomicAL
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 02/10/2026
Next on ELSA #PaperDay : we're delighted to say that Ben Granett's fabulous spectroscopy tool GELSA is now on pypl - just install with pip install gelsa See also github.com/elsa-euclid/...
github.com
GitHub - elsa-euclid/gelsa-notebooks: Notebooks showcasing GELSA
Notebooks showcasing GELSA. Contribute to elsa-euclid/gelsa-notebooks development by creating an account on GitHub.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 02/10/2026
Next in our ELSA #PaperDay is some nice work by Fabio Rigamonti, who predicted how VESPER at the future Extremely Large Telescope will show how galactic structures emerge and evolve. The paper's in a white book for a third-generation instrument on the ELT
comparison of physical size in kpc (from 0.1 to 10) against redshift (from 1 to 4), with the VESPER pixel size and selector field of view show, the JWST pixel size (larger than VESPER), the Re(z) from Ormerod et al. 2024, and the range where it observes the rest-frame optical (defined as 0.4-0.7 microns).
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 02/10/2026
And Jurgen's third #PaperDay paper derived the physical properties of each clump, such as stellar mass, age, dust extinction and star-formation rate, concluding there's inward-migration of the clumps which formed in situ through violent disk instabilities arxiv.org/abs/2609.20079
Clump stellar mass function (cSMF) of the clump populations detected in the CLAUDS/HSC-SSP galaxy sample for different clump age bins.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 02/10/2026
That paper's at academic.oup.com/rasti/articl... . Jurgen's second paper in our #PaperDay looks at the cosmic evolution of these clumps, diagnosing the drivers of cosmic stellar mass assembly academic.oup.com/mnras/articl...
Plot of clumpy fractions as a function of redshift published by various authors.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 02/10/2026
It's another ELSA #PaperDay! First up is a collection of three papers by Jurgen Popp. His first paper uses deep learning to detect star-forming clumps in @ec-euclid.bsky.social data with Faster-RCNN
Clumpy galaxies, with clumps annotated as square boxes. The images of galaxies have a 10kpc scale bar.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 01/10/2026
The event was in Bologna, Italy. More details here: www.nottedeiricercatori-society.eu/la-notte
nottedeiricercatori-society.eu
La Notte
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 01/10/2026
ELSA member Pietro Bergamini warping members of the public (painlessly) at "La Notte delle ricercatrici e dei ricercatori" last week, demonstrating the @ec-euclid.bsky.social space telescope's discoveries of gravitational lenses 🔭
Members of the public holding a dark cloth taut, for demonstrating motion in curved spacetime Members of the public holding a dark cloth taut for demonstrating motion in a curved spacetime, with a ball bearing resting on the cloth curving the space or cloth around it Pietro running a real time warp-yourself simulation, showing what you look like when warped by gravitational lensing. A member of the public is holding a ball bearing between finger and thumb, which is being warped into curved arcsA scale model of the Euclid space telescope on a window ledge. There is also a model astronaut on the window ledge.
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Prof Stephen Serjeant @stephenserjeant.bsky.social · 12/08/2026
I stole the primary mirror of a (Lego) @esa.int Euclid space telescope and used it to project the solar eclipse @ec-euclid.bsky.social 🧪🔭
Lego Euclid space telescope with its stolen piece next to it. Also in frame: weeping angelShadow of my hand holding Euclid lego primary mirror using it as a pinhole for projecting the partial solar eclipse
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Katie Mack @astrokatie.com · 14/10/2023
🌓🌎🌞 <-- lunar eclipse 
🌎🌓🌞 <-- solar eclipse 
🌎🌞🌗 <-- apocalypse
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Euclid Consortium @ec-euclid.bsky.social · 03/07/2026
If you are in the London/UK area right now, #Euclid has an interactive exhibition at the @royalsociety.org's #SummerScience exhibition. Open until Sunday 5 July. See you there! #ESAEuclid #astronomy #space #research
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ESA Space Science @science.esa.int · 08/06/2026
And if you're into #CitizenScience, Euclid's Space Warps is another @zooniverse.bsky.social project where you can help spot galaxies bending spacetime 👉 spacewarps.org, now available also in #Japanese So far, volunteers made over two million classifications 👏 3/3 🔭 🧪
Three strong gravitational lenses found in the Euclid data. Left: two different galaxies (at different distances) are lensed by the same galaxy (ID: 119647449) Middle: a face-on spiral with a rare, lensed background source in the centre (ID: 119679277) Right: a near complete Einstein-ring in a galaxy with a pronounce dust lane (ID: 119674016).
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ESA Space Science @science.esa.int · 08/06/2026
Work with public data from our Euclid mission and help refine machine models that will scout the 250 million galaxies Euclid is expected to image that could host such clumps. Discover all details here 👉 www.zooniverse.org/projects/hug... 2/3 🔭 🧪 #CitizenScience
zooniverse.org
Galaxy Zoo: Clump Scout II | Zooniverse - People-powered research
Correct machine predictions to reveal the shapes of stellar nurseries!
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ESA Space Science @science.esa.int · 08/06/2026
Help scientists find clumps of star-forming regions in galaxies with the @galaxyzoo.org project Clump Scout II on @zooniverse.bsky.social! 1/3 🔭 🧪 #CitizenScience
The Galaxy Zoo: Clump Scout II interface. An image of a galaxy that the model thinks is clumpy is visible on the left side. It has different coloured boxes, representing different types of astrophysical objects – green for clumps, yellow for foreground stars, blue background galaxies and red for galaxies’ central bulges. A panel on the right gives users the chance to review these labels.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 29/05/2026
At the @ec-euclid.bsky.social meeting, Pietro Bergamini showing narrow-band spectroscopic images of gravitational arcs - like from the beautiful galaxy cluster gravitational lens in his title slide here. The curved arcs are background galaxies seen through warped spacetime 🧪🔭
Pietro Bergamini presenting an Overview of the Q1 and Q2 splashes - strong lensing. His slide background has a galaxy cluster with some gravitational arcs
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 26/05/2026
Also congratulations to ELSA member and working group leader Ben Granett for winning the Euclid star prize for a senior scientist! Ben's 2d spectral extraction software GELSA, developed for the ELSA project, is having a huge impact within @ec-euclid.bsky.social 🧪🔭 www.euclid-ec.org/consortium/s...
euclid-ec.org
STARs2026 – Euclid Consortium
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 26/05/2026
News from the Euclid Consortium Meeting in Barcelona: Kudos to ELSA member Andrea Enia for winning the Euclid Star Prize (junior category)! 🧪🔭
Title slide of Andrea's presentation: A first view of the star-forming main sequence in the Euclid Deep Fields2026 Star Prize slide with Andrea Enia's photo
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 26/05/2026
Would you like to rummage data from the Euclid space telescope, and uncover cosmic nurseries where stars like our Sun are born? We're delighted to announce our new @ec-euclid.bsky.social @zooniverse.bsky.social citizen science project, Galaxy Zoo Clump Scout 2 🧪🔭 www.zooniverse.org/projects/hug...
zooniverse.org
Galaxy Zoo: Clump Scout II | Zooniverse - People-powered research
Correct machine predictions to reveal the shapes of stellar nurseries!
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Euclid Consortium @ec-euclid.bsky.social · 04/05/2026
3000 volunteers have already made nearly 900,000 classifications, yet 70% of the project are still to be done. All the background and link to the Zooniverse: www.zooniverse.org/projects/apr... #ESA #Euclid #astronomy #GravitationalLensing #science #CitizenScience.
Euclid data: a tilted galaxy with fainter arcs around its center.Euclid data: multiple galaxies surrounded by an arc.
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Euclid Consortium @ec-euclid.bsky.social · 04/05/2026
Would you like to be part of citizen science astronomy? We invite you to classify gravitational lens candidates in so-far unreleased #ESAEuclid data: "Space Warps – ESA Euclid DR1". #ESA #Euclid #astronomy #GravitationalLensing #science #CitizenScience.
Euclid data: A spiral galaxy seen edge on, with a dust lane in the center and two small patches outside its bulge.
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Euclid Consortium @ec-euclid.bsky.social · 21/04/2026
We’re announcing the next Space Warps Citizen Science campaign with #Euclid data – now previewing images from Data Release 1. Here is how to become part of the project: www.euclid-ec.org/space-warps-... #astronomy #science #GravitationalLenses #ESA #space #CitizenScience #ESAEuclid #Zooniverse
euclid-ec.org
Space Warps – Euclid DR1
A space mission to map the Dark Universe
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Euclid Consortium @ec-euclid.bsky.social · 21/04/2026
Space Warps is back! Do you want to join forces with #Euclid Consortium scientists and discover gravitational lenses that no human has ever seen before? #astronomy #science #GravitationalLenses #ESA #space #CitizenScience #ESAEuclid #Zooniverse
Mosaic of gravitational lense images, found in early data of the Euclid mission.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 21/04/2026
Today the Euclid space telescope team are launching a new search for Space Warps! Come and be the first to find warps in space and time in Euclid's unseen Data Release 1, before the DR1 publication in October @ec-euclid.bsky.social 🧪🔭 www.zooniverse.org/projects/apr...
zooniverse.org
Space Warps - ESA Euclid | Zooniverse - People-powered research
Elusive strongly lensed galaxies are waiting to be discovered!
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 13/03/2026
. @ec-euclid.bsky.social & ELSA team member @stephenserjeant.bsky.social taking risks by predicting AI progress. We’re using lots of machine learning in ELSA but we’re all a very, very long way from replacing astrophysicists 🧪🔭
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 19/02/2026
You're right, and this is of course always a consideration, but it's also trivial to create lookalike accounts with similar usernames, so keeping hold of the handle doesn't insulate a person or institution from the risk of impersonation
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 19/02/2026
Meanwhile, here's the terribly boring ceiling in the room next to where the ELSA meeting is happening. Why are university rooms and buildings always so dull dull dull?
GLORIOUS beautiful guilded ceiling with frescos of mythological characters, gods flying in the sky with horses, ships, marble, shells, ...
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 19/02/2026
At our f2f meeting today we decided to delete our dormant Twitter/X account, following the excellent example of @ec-euclid.bsky.social. 🧪🔭
Screenshot of our dormant Twitter/X account, showing only one post and a pop-up saying "You aren't verified yet". Screenshot of our Twitter/X account page after deletion, saying this account doesn't exist.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 17/02/2026
The ELSA @ec-euclid.bsky.social team meeting this week in beautiful Bologna. Amazing things being done with Euclid spectroscopy - watch this space :) 🧪🔭
ELSA team members, smiling, standing under the ELSA logo
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 16/01/2026
Paper day!! Very nice ELSA @ec-euclid.bsky.social result by Fabrizio Gentile and team, using Euclid's huge dataset to unpick how galaxies' star formation, environment and morphology are connected. Just accepted by A&A 🧪🔭 arxiv.org/abs/2511.02964
The two pathways to forming a present-day quiescent spheroid, starting from a star forming disc: field galaxies start with secular bulge formation to make a star-forming spheroid, then internal quenching finished the job, but galaxies in high-density environments start with environmental quenching to make a quiescent disc galaxy, then morphological transformation finishes the job to end again in a quiescent spheroid.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 31/12/2025
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...
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".
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Euclid Consortium @ec-euclid.bsky.social · 21/12/2025
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
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Euclid Consortium @ec-euclid.bsky.social · 21/12/2025
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
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Euclid Consortium @ec-euclid.bsky.social · 21/12/2025
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
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maggie10043.bsky.social @maggie10043.bsky.social · 10/12/2025
In Brera (Milan) to present how @elsa-euclid.bsky.social will use AI to study galaxies! @ec-euclid.bsky.social
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Euclid Consortium @ec-euclid.bsky.social · 22/11/2025
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 🔭
Sky viewing tool with Euclid's Dark Cloud in the infrared on top of a ground-based visible image.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 20/11/2025
Beautiful comparison of @ec-euclid.bsky.social's infrared view of an interstellar dark cloud, compared to what we see in optical light 🧪🔭 www.youtube.com/watch?v=MlmQ...
youtube.com
Infrared vs Optical: Euclid reveals what lies within and behind the Dark Cloud
YouTube video by Euclid Consortium
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 20/11/2025
wow....
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 20/11/2025
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... 🧪🔭
euclid-ec.org
Here Comes the Sun…
A space mission to map the Dark Universe
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 13/11/2025
Blog post by @ec-euclid.bsky.social PhD student Ruby Pearce-Casey from her #DISCnet industry placement with #KeenAI, deploing her AI skills to new areas. Earlier, Ruby made a breakthrough in finding strong gravitational lenses in Euclid imaging using machine learning keen-ai.com/blog/anticip... 🧪🔭
keen-ai.com
Anticipating Geomagnetic Storms: Reflections at the Halfway Point (Part 2)
Keen AI and National Grid secure Ofgem funding to develop FoSMO, the UK’s first shared AI vision model to transform electricity network asset management.
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Prof Stephen Serjeant @stephenserjeant.bsky.social · 13/11/2025
Very nice blog post by my grad student Ruby Pearce-Casey (who's done excellent @ec-euclid.bsky.social work on finding strong gravitational lenses), from her #DISCnet industry placement with #KeenAI 🧪🔭 keen-ai.com/blog/anticip...
keen-ai.com
Anticipating Geomagnetic Storms: Reflections at the Halfway Point (Part 2)
Keen AI and National Grid secure Ofgem funding to develop FoSMO, the UK’s first shared AI vision model to transform electricity network asset management.
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Knud Jahnke @knudjahnke.bsky.social · 11/11/2025
Let me tell you, our officially-not-an-X-ray-telescope #ESAEuclid did notice this flare. Very much so. A gazillion cosmic ray hits, plus a shadow of hardware where the instruments aren't fully X-ray shielded. I mean this was the 39th (?) strongest flare in 30 years.
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CosmicRami 🏳️‍🌈🏳️‍⚧️ @rami.spaceaustralia.com · 11/11/2025
Whoa. The scale of this thing. That blast wave radiating away from the flare location is impressive. Esp. when you think about the size of the Earth in comparison. It’s so very near that we live so close to a star and can watch its behaviour and activity. A star and it’s just right there!
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 07/11/2025
Many other @ec-euclid.bsky.social papers being released this week, including by Daniela Vergani and team on discoveries of galaxies with unusual emission lines - here's an explainer by @stephenserjeant.bsky.social 🧪🔭
"Euclid's ability to cover such a large area of sky makes it a marvellous place to find rare objects that often could not be discovered in any other way. Euclid also doesn't just take images; its spectroscopic instrument also splits light up like a rainbow to diagnose how redshifted (how far away) each galaxy is and the conditions inside each galaxy. In this paper [Vergani et al] we used Euclid's spectroscopic instrument to unveil a population of rare galaxies with stronger ionizing radiation inside them, perhaps caused by a curious, unusual history of star formation that's assembling the stellar masses of galaxies. Unpicking this will be the subject of a lot of future research, and this is just the tip of the iceberg of the rare object discoveries awaiting us with Euclid."
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 07/11/2025
Many new @ec-euclid.bsky.social papers have just been released too, including this beautiful morphological tuning fork of galaxies 🔭🧪 This page is interactive - have a play! www.euclid-ec.org/euclid-morph...
euclid-ec.org
Euclid’s view of the ‘Morphological Tuning Fork’ of galaxy classifications
A space mission to map the Dark Universe
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 07/11/2025
Some marvellous @ec-euclid.bsky.social press releases just out! A beautiful image of a shimmering infrared dark cloud observed with Euclid www.esa.int/ESA_Multimed...
Image taken by the Euclid space telescope of stars on a dark background, with wispy clumps in the foreground that comprise an infrared dark cloud, made visible via Euclid's infrared camera.
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 02/07/2025
Rather lovely blog marking the second anniversary of the launch of @ec-euclid.bsky.social, by @knudjahnke.bsky.social www.euclid-ec.org/second-anniv... 🔭🧪
euclid-ec.org
Second anniversary of Euclid in space
A space mission to map the Dark Universe
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 20/06/2025
arXiv version of the paper: arxiv.org/abs/2506.15644
arxiv.org
Candidate Dark Galaxy-2: Validation and Analysis of an Almost Dark Galaxy in the Perseus Cluster
Candidate Dark Galaxy-2 (CDG-2) is a potential dark galaxy consisting of four globular clusters (GCs) in the Perseus cluster, first identified in Li et al. (2025) through a sophisticated statistical m...
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ELSA: Euclid Legacy Science Advanced analysis tools @elsa-euclid.bsky.social · 16/06/2025
"Almost dark galaxy" discovered with the help of the @ec-euclid.bsky.social archive - press release in English 🧪🔭 www.statistics.utoronto.ca/news/candida...
statistics.utoronto.ca
Candidate Dark Galaxy-2: U of T researchers shine new light on the universe’s darkest realms.
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