Daniel Pomarède
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pomarede.bsky.social
Daniel Pomarède
@pomarede.bsky.social
Cosmographer at Univ. Paris-Saclay | mapping the Universe | co-discoverer of Laniakea (our home supercluster of galaxies), Hoʻoleilana, and some other (very) large scale structures
📖 https://orcid.org/0000-0003-2038-0488
▶️ https://vimeo.com/pomarede
Pinned
Martian robot spinning her turret!

A video sequence captured by the Perseverance rover using her Right Mastcam-Z science Camera on Jan. 27, 2024 (Sol 1044). The full sequence, accelerated here, actually took 3 minutes.
Credit images: NASA/JPL-Caltech/ASU
Reposted by Daniel Pomarède
A new study published in Geophysical Research Letters casts doubt on a 2018 discovery of a briny lake potentially lurking beneath Mars’s south polar cap. 🧪 🔭

Read the full story: buff.ly/JRpyeku
November 25, 2025 at 6:20 PM
Reposted by Daniel Pomarède
Yesterday, when I was leaving work I had to pull over and grab this photo — cause the clouds above one of the old radio telescopes at work looked really good. Puffy blobs sinking under their weight.

This is Remus 📡

I’ve stretched the image a little by increasing contrast, and foreground shadows.
November 25, 2025 at 7:59 PM
Reposted by Daniel Pomarède
Si c'est votre anniversaire aujourd'hui, vous le partagez avec Madeleine Brès, première Française à obtenir son diplôme de médecine

(Et bon anniversaire ! 🎉)
L'incroyable parcours de Madeleine Brès, première Française à obtenir son diplôme de médecine
l.sciencesetavenir.fr
November 25, 2025 at 8:09 PM
Reposted by Daniel Pomarède
Chandra's Fall Collection 🍂

A quartet of images that invoke themes associated with autumn

1. NGC 6334 nebula: Cosmic leaves blowing
2. SNR G272.2-03.2: The Space Pumpkin
3. R Aquarii: A cosmic sweater
4. NGC 2207 and IC 2163: A pair of galactic cornucucopia

chandra.harvard.edu/photo/2025/f... 🔭🧪
November 25, 2025 at 12:59 PM
Reposted by Daniel Pomarède
If your planet's not too big, and your transit spectrum is flatter than you'd think, your aerosols might be clumpy.
Owen+ arxiv.org/abs/2511.19013
🧪🔭🪐 #exoplanets
Resolving the flat-spectrum conundrum: clumpy aerosol distributions in sub-Neptune atmospheres
Transmission spectroscopy of sub-Neptunes was expected to reveal their compositions and hence origins, yet many show flat near- to mid-infrared spectra. Such spectra can be explained either by metal d...
arxiv.org
November 25, 2025 at 8:32 AM
Reposted by Daniel Pomarède
Reposted by Daniel Pomarède
Et demain, on consacrera notre émission à Archimède, le grand savant antique !
Calcul de Pi, poussée d'Archimède... Nous verrons comment son travail a irrigué les mathématiques et l'ingénierie 📐
Ce sera à 16h sur @franceculture.fr ! #ScienceCQFD
November 25, 2025 at 3:58 PM
Reposted by Daniel Pomarède
NASA’s Europa Clipper captured this image of a starfield - and the planet Uranus - on Nov. 5, 2025, while experimenting with one of its 2 stellar reference units. These star-tracking cameras are used for maintaining spacecraft orientation.

science.nasa.gov/photojournal... 🧪🔭 #Europa #EuropaClipper
November 24, 2025 at 9:17 AM
Reposted by Daniel Pomarède
Mars-bound ESCAPADE mission captures first selfies

One of the two #ESCAPADE spacecraft used its Visible and Infrared Observation System (VISIONS) cameras to capture images showing part of a solar panel, showing the cameras are working well. #Mars 🧪🔭

science.nasa.gov/blogs/escapa...
November 25, 2025 at 9:01 AM
Reposted by Daniel Pomarède
In Saturn's upper atmosphere G is 1.07 Earth G - it's a great place for flying cities (as is the atmosphere of Venus, btw).

You owe it to yourself to imagine a city in the upper atmosphere of Saturn today.
Saturn is currently the best place to set your space opera, according to science--it's got those gorgeous rings, and it also has a TON OF MOONS. @jdnicoll.bsky.social offers worldbuilding tips for Saturn-based stories!
Consider Setting Your Space Operas on Saturn - Reactor
...or more precisely, on one of its many, many moons!
reactormag.com
November 25, 2025 at 3:17 PM
Reposted by Daniel Pomarède
NASA Mars Perseverance Rover at Jezero crater
Sol 1,693 (24th Nov, 2025)

Latest abrasion

MastCam-Z (left) ZCAM04280
Site 81 / 3608
📷 Credits: NASA / JPL-Caltech / ASU / MSSS / Martian-Observer
November 24, 2025 at 11:22 PM
Reposted by Daniel Pomarède
Coprates Chasma - Mars Reconnaissance Orbiter - From Aster Cowart (terrasabaea.bsky.social) - https://flic.kr/p/2kfw6WT
November 25, 2025 at 2:00 PM
Reposted by Daniel Pomarède
📣Conférence publique @iap.fr par Sébastien Renaux-Petel, mardi 2 décembre 2025 à 19h30, en direct sur youtu.be/Ll_WByiBvu0 📡programme sur www.iap.fr/science/conf... @cnrs-insu.bsky.social @cnrs-paris.bsky.social @sorbonne-universite.fr
November 25, 2025 at 10:57 AM
Chandra's Fall Collection 🍂

A quartet of images that invoke themes associated with autumn

1. NGC 6334 nebula: Cosmic leaves blowing
2. SNR G272.2-03.2: The Space Pumpkin
3. R Aquarii: A cosmic sweater
4. NGC 2207 and IC 2163: A pair of galactic cornucucopia

chandra.harvard.edu/photo/2025/f... 🔭🧪
November 25, 2025 at 12:59 PM
Reposted by Daniel Pomarède
The night sky is not the only marvel of the Atacama Desert.

One example? The Licancabur volcano, one of the great gatekeepers of ALMA. 5920 m high, it‘s part of a chain of mountains that separate Chile and Bolivia 🌋

https://www.eso.org/public/images/licancabur-yuri/  🔭
November 25, 2025 at 11:03 AM
Reposted by Daniel Pomarède
I do love me some spacecraft selfies :)
Mars-bound ESCAPADE mission captures first selfies

One of the two #ESCAPADE spacecraft used its Visible and Infrared Observation System (VISIONS) cameras to capture images showing part of a solar panel, showing the cameras are working well. #Mars 🧪🔭

science.nasa.gov/blogs/escapa...
November 25, 2025 at 9:31 AM
Mars-bound ESCAPADE mission captures first selfies

One of the two #ESCAPADE spacecraft used its Visible and Infrared Observation System (VISIONS) cameras to capture images showing part of a solar panel, showing the cameras are working well. #Mars 🧪🔭

science.nasa.gov/blogs/escapa...
November 25, 2025 at 9:01 AM
Reposted by Daniel Pomarède
Cosmography archives

Nêbuleuses découvertes par différens Astronomes, que M. Messier a cherchées inutilement.

Connoissance des Temps, ou Connoissance des Mouvemens Célestes, Pour l'Année bissextile 1784, pp 268-269.

gallica.bnf.fr/ark:/12148/b... 🧪🔭
November 24, 2025 at 3:05 PM
Reposted by Daniel Pomarède
Thank you for your past service, Senator Kelly - and for your service today, by standing up to the authoritarians.
you fire right back at them and you FIRE RIGHT AWAY.
November 24, 2025 at 6:58 PM
Reposted by Daniel Pomarède
have you ever been somewhere so dark you could step outside & immediately spot the Milky Way? i traveled to the Upper Peninsula to learn about efforts to balance industrialization & economic growth with the preservation of starry skies:

www.nytimes.com/2025/11/24/s...
Fighting for ‘The Right to Night’ Under Starry, Rural Skies
www.nytimes.com
November 24, 2025 at 5:21 PM
Cosmography archives

Nêbuleuses découvertes par différens Astronomes, que M. Messier a cherchées inutilement.

Connoissance des Temps, ou Connoissance des Mouvemens Célestes, Pour l'Année bissextile 1784, pp 268-269.

gallica.bnf.fr/ark:/12148/b... 🧪🔭
November 24, 2025 at 3:05 PM
Reposted by Daniel Pomarède
From @noirlabastro.bsky.social: To celebrate 25 years of the Gemini Observatory, we’re launching a two-part Blog series! Today, we’re exploring the history of how an international collaboration created the next generation of world-class 8-meter telescopes. #astronomy

🔗 ow.ly/FNRC50XumLm
Blog: 25 Years of Gemini Part I: The Origin of the International Gemini Observatory How a bold international collaboration launched an ambitious project to create the next generation of world-class 8-...
25 Years of Gemini Part I: The Origin of the International Gemini Observatory
ow.ly
November 24, 2025 at 1:19 PM
Reposted by Daniel Pomarède
In an essay in The New Yorker, Tatiana Schlossberg says she has acute myeloid leukemia. She also criticized her relative, Robert F. Kennedy Jr. n.pr/4oWPvg3
Tatiana Schlossberg, the granddaughter of JFK, says she has a rare terminal cancer
In an essay in The New Yorker, Tatiana Schlossberg says she has acute myeloid leukemia. She also criticized her relative, Robert F. Kennedy Jr.
n.pr
November 24, 2025 at 4:19 AM
Reposted by Daniel Pomarède
Physicists working on the ALPHA experiment at CERN have trapped and accumulated 15,000 antihydrogen atoms in less than 7 h. This accumulation rate is more than 20 times the previous record. 🧪⚛️ ow.ly/iKgP50XvMEC
Sympathetic cooling gives antihydrogen experiment a boost – Physics World
Having more antimatter could help solve profound mysteries of physics
ow.ly
November 21, 2025 at 2:42 PM
Reposted by Daniel Pomarède
A highly reflective area at the base of Mars's southern polar ice cap hinted at the potential presence of liquid water. But new radar measurements suggest there may be another explanation. New research in #AGUPubs by scientists at @psi.edu & colleagues.
Maybe That’s Not Liquid Water on Mars After All - Eos
A “very large roll” of a radar instrument offers new insight into a highly reflective area near the Martian south pole.
eos.org
November 23, 2025 at 2:55 PM