Remco de Kok

Auto-portrait du rover Perseverance à contre-jour acquis le 11 mars 2026 (sol 1797) à 10h30 heure locale martienne. Le rover se situe à proximité d'un ensemble de rochers de couleur gris-bleuté. Le sol est de couleur ocre et le ciel beige pâle. Au loin s'élèvent des collines. © NASA/JPL-Caltech/Thomas Appéré

🤳 Selfie de Perseverance réalisé ce matin sur Mars alors qu'il analyse des rochers très intéressants situés non loin de "Lac de Charme".
📷 Cette photo est une mosaïque de 42 images individuelles.
🔎 En plus haute définition ici www.flickr.com/photos/thoma...

JWST image at 11.3 micron, with starlight blocked. You can nicely see the planet (with Airy ring).

JWST image at 25.5 micron, with starlight blocked. You can nicely see the planet.

Happy eps Ind Ab day! Possible water clouds on this cool (also literally) planet from JWST images in the near- and mid-infrared.
Sanghi+ arxiv.org/abs/2603.08787
Matthews+ arxiv.org/abs/2603.08780
🧪🔭 #exoplanets

Photo of a cuneiform tablet fragment shaped a bit like an irregular diamond. It preserves nearly 20 incomplete lines of text separated by a horizontal ruling

There's a broken cuneiform tablet from the Old Babylonian period, nearly 4,000 years ago, which preserves a tiny portion of a dialogue between two friends.

It feels a bit like the conversations I've been having for the past week, so I wanted to share it.

Some more info in this thread bsky.app/profile/mmmm...

Cool! Isotopic ratios of H,C,N of our favorite interstellar intruder 3I/ATLAS are different from our solar system. If I understand OK, it means colder and older environment.
Opitom+ arxiv.org/abs/2603.07187
Cordiner+ arxiv.org/abs/2603.06911
Salazar Manzano+ arxiv.org/abs/2603.07026
🧪🔭☄️

We live in a time when the greedy people just don't care anymore.
(I assume the page charges were leading here)

I'm so sorry to hear that. Wishing you all the strength in the world.

The image show the dark silhouette of a tree and rooftops at bottom, with the Sun right above the tree. Sundogs are visible left and right of the moon, a faint halo can be seen and a concave arc at top in the image. This is the upper tangent arc. The lower half of the sky is brownish from dust in the sky.

Faint #halo, #sundogs and upper tangent #arc around the #Sun through Saharan dust right now.

My dad's dad grew vegetables in a glass house. My mother's dad worked at a bank (I think?). I looked up my ancestors from both sides and it's basically all gardeners, builders, and farm hands 6 generations deep.

When someone says „Scientists do not want you to know“ you can dismiss everything from there on. Scientists want you to know. They are desperate that you know. They can’t shut up about what they found out and want you to know.

Het is misschien ook deels omdat de cirkels niet in hetzelfde perspectief staan? Zijn ovaaltjes of 'gekantelde' vierkantjes beter?

Amazing weather here. At least there's that.

Similar here this week!

Beautiful diagrams from a circa 17th-century copy of Muslim polymath Ismail al-Jazarī’s *Book of Knowledge of Ingenious Mechanical Devices*, originally published in 1206: https://publicdomainreview.org/collection/arabic-machine-manuscript

CNN reporting that the strikes on Iran tonight are joint US and Israeli strikes.

Which means Donald Trump should be impeached for a third time.

What he has done tonight is illegal under the US constitution and the UN charter.

The state of the world matches the state of my brains these last few years....

"Seems" is my favourite word, because so many things seem so subjective to me.

It seems like most of the noticeable technological advancements of the last decades are in software, not so much in hardware. Cars, houses, trains,... pretty much look the same. Drones are the exception I guess. And the size of mobile phones? Or am I missing stuff?

It is time we stop this madness. Just because you can, doesn't mean you should. We have to stop these billionaires ruining our planet.

Spaanse programmeur krijgt per ongeluk het gezag over een leger van robotstofzuigers

Heerlijke kop :)

Still writing "planet" instead of "plant". It's deeply engrained.

"De bijna blinde Rohingya-vluchteling Nurul Amin Shah Alam, die nauwelijks Engels spreekt, wordt door Border Patrol opgepakt en later vrijgelaten bij een tankstation in Buffalo, 7 kilometer van zijn huis, zonder telefoon, vervoer (...). Enkele dagen later wordt hij dood op straat aangetroffen." 💔

Image of blue bands/spots and a violet extended spot near the lower-left lib

No spots or bands. 3.26 to 3.36 Microns

Emission at 4.35 Microns. Likely aurora.

(1/2)
Planet #Neptune with #JWST NIRSpec. Observation date: 2025-11-27

First image (color) is a combination of blue (2.88 to 3.1 Microns) and orange (4.21 to 5.02 Microns) with emission around 4.35 Microns (aurora H3+ emission) in violet.

The Nordic Excluded.

Werk! Op de afdeling van @ionica.mathstodon.xyz.ap.brid.gy en deels op de Sterrewacht Leiden careers.universiteitleiden.nl/job/Assistan...

A red-white striped parachute seen from below against a reddish-grayish sky.

The perseverance heatshield falling away towards the surface of Mars. The inside is black and has serveral orange cables running across. around the perimeter are eight spiral springs that helped to push the heatshield away.

The Perseverance rover as seen from the skycrane above, dangling from three ropes and a cable umbilical. The Red Mars dust from the surface is getting blown away where the plume from the skycrane hits the the martian surface. The rover deck is still remarkably clean as compared to later in the mission.

The skycrane from below, partially obscured by Mars dust and small rocks it flies away. Each of the four corners has a pair of thrusters and the umbilical cable that has just been cut is curled up below the skycrane.

I can't believe it has already been 4 years since the Perseverance rover landed on Mars! #planetsci

The rover was equipped with six engineering camera that captured more than 26.000 images during the landing!

This thread contains some of my favorites:

Starting this Friday, four separate #JWST programmes will be exploring physical processes in Jupiter's atmosphere and ionosphere. We're asking amateur astronomers to help provide context imaging over the next few weeks to understand how the atmosphere is changing with time. #planetaryscience

This is also because they let more water flow through the rivers, which have been dried up in recent decades. It's not like they are planting trees throughout the desert. See e.g. some promo here en.people.cn/n3/2025/0930...
It's a fascinating area, I think.

It's great, but it would be nice to see credits.

Cloud!