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Denis Grodent

@denisgrodent

Planetary scientist and Professor at the Université de Liège. Grey is just dark white

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15.10.2023
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Latest posts by Denis Grodent @denisgrodent

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Auroras on Jupiter's giant moon Ganymede look like Earth's northern lights, NASA spacecraft reveals The ultraviolet auroras were imaged by NASA's Juno probe on a brief flyby.

Auroras on Jupiter's giant moon Ganymede look like Earth's northern lights, NASA spacecraft reveals www.space.com/astronomy/ju...

04.03.2026 19:05 👍 7 🔁 3 💬 0 📌 0
Liege train station as a modern art piece

Liege train station as a modern art piece

Liege train station as a modern art piece

Liege train station as a modern art piece

Liege train station as a modern art piece

Liege train station as a modern art piece

Liege train station as a modern art piece

Liege train station as a modern art piece

Liège-Guillemins train station as a modern art piece

The station was designed by the Spanish architect and engineer Santiago Calatrava, who is famous for his futuristic, skeletal structures (he also designed the Oculus in NYC).

22.02.2026 15:44 👍 80 🔁 13 💬 0 📌 1
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University of Liège Scientists Reveal Similarities Between Auroras on Ganymede and Earth Des observations menées sur la plus grande lune du système soaire révèlent que les processus physiques à l'origine des aurores sont universels et ne se limitent pas aux planètes.

An international team of astrophysicists, led by researchers from @universitedeliege.bsky.social, has published new observations of Ganymede revealing a striking similarity between its auroras and those on Earth. A 🧵 about 🔭. #planetsci #jupiter #juno #aurora www.star.uliege.be/cms/c_136561...

19.02.2026 16:51 👍 24 🔁 8 💬 1 📌 1
For the first time, an international team of astronomers have mapped the vertical structure of Uranus’s upper atmosphere, uncovering how temperature and charged particles vary with height across the planet. Using Webb’s NIRSpec instrument, the team detected the faint glow from molecules high above the clouds. These unique data provide the most detailed portrait yet of where the planet’s auroras form, how they are influenced by its unusually tilted magnetic field, and how Uranus’s atmosphere has continued to cool over the past three decades. The results offer a new window into how ice-giant planets distribute energy in their upper layers.

Two bright auroral bands were detected near Uranus’s magnetic poles, together with reduced emission and ion density in part of the region between the two bands (a feature likely linked to transitions in magnetic field lines).

For the first time, an international team of astronomers have mapped the vertical structure of Uranus’s upper atmosphere, uncovering how temperature and charged particles vary with height across the planet. Using Webb’s NIRSpec instrument, the team detected the faint glow from molecules high above the clouds. These unique data provide the most detailed portrait yet of where the planet’s auroras form, how they are influenced by its unusually tilted magnetic field, and how Uranus’s atmosphere has continued to cool over the past three decades. The results offer a new window into how ice-giant planets distribute energy in their upper layers. Two bright auroral bands were detected near Uranus’s magnetic poles, together with reduced emission and ion density in part of the region between the two bands (a feature likely linked to transitions in magnetic field lines).

🆕 This NASA/ESA/CSA James Webb Space Telescope maps Uranus’s upper atmosphere in unprecedented detail. 🧪🔭

🔗 esa.int/Science_Exploration/Space_Science/Webb/Webb_maps_Uranus_s_mysterious_upper_atmosphere

@science.esa.int

19.02.2026 14:58 👍 139 🔁 21 💬 2 📌 5

In Belgium we pay around 1.5€/liter which is ~$6.7/gallon. It is not too expensive, considering that most cars are reasonably low on gas. The electricity for a corresponding EV car is nearly half of this.

18.02.2026 19:21 👍 2 🔁 0 💬 0 📌 0
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🪐 Breaking News from Saturn! A new study led by Lina Hadid at Laboratory of Plasma Physics discovered that the tiny moon Enceladus has a huge impact around Saturn, trailing a wake of electromagnetic ripples over half a million kilometres 👉 Read the press release: bit.ly/tiny-enceladus

09.02.2026 14:48 👍 8 🔁 3 💬 1 📌 0
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You may have seen pictures, but have you ever seen video of a gigantic jet #TLE from space?

Astronaut Jeanette Epps captured this incredible sequence on July 20th, 2024 for the DTU/@science.esa.int Thor-Davis experiment. 🧪🔭

youtu.be/xN2J7_rOBJY

Credit: ESA/NASA/J. Epps
Processing: Simeon Schmauß

30.01.2026 21:09 👍 538 🔁 220 💬 15 📌 18

Ces pays contrôlent collectivement une grande partie des ressources stratégiques naturelles telles que le pétrole, le gaz, les métaux rares et les minéraux précieux. Pas besoin de chercher plus loin.

22.01.2026 12:12 👍 0 🔁 0 💬 0 📌 0
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Ever wondered what powers a solar flare? 💥

Solar Orbiter is finally giving us answers to this long-standing mystery.

The mission caught a 'magnetic avalanche' on the surface of the Sun just before a flare was released.

🔭🧪1/3

21.01.2026 08:16 👍 289 🔁 74 💬 2 📌 14

Merci !

19.01.2026 23:41 👍 1 🔁 0 💬 0 📌 0
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This was tonight (19 Jan) over south east Belgium ( near Liège)

19.01.2026 23:25 👍 7 🔁 1 💬 1 📌 0
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19.01.2026 22:44 👍 1 🔁 0 💬 0 📌 0
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Rare and beautiful #aurora above #Esneux #Belgium (50.5 deg north) 19 Jan 2026

19.01.2026 22:41 👍 4 🔁 0 💬 1 📌 0
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There is an increased chance of seeing the aurora tonight

The best odds across northeast Scotland where skies are looking clearer. Keep your eyes on the northern horizon! 👀✨

13.01.2026 16:36 👍 265 🔁 56 💬 4 📌 7
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Un « cordon sanitaire médiatique » pour faire barrage à l’extrême droite En Belgique francophone, le « cordon sanitaire » a été créé il y a une trentaine d'années.
11.01.2026 09:05 👍 2 🔁 2 💬 0 📌 0
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When you look at that bright point of light this evening, think of the Jovian fleet. #Juno (2016) is there right now, peering beneath the cloudy veil. #EuropaClipper (2030) and #ESAJuice (2031) are sailing through interplanetary space with a mission to explore Jupiter's ocean moons. (Credit: ESA)

10.01.2026 12:21 👍 24 🔁 13 💬 2 📌 0
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Ice towers of Callisto.
#SciArt #spaceart #astronomy #solarsystem

06.01.2026 22:36 👍 168 🔁 48 💬 4 📌 1
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Components of RNA among life’s building blocks found in NASA asteroid sample – Physics World Samples from the near-Earth asteroid Bennu found to contain molecules and compounds vital to the origin of life

More molecules and compounds vital to the origin of life have been detected in asteroid samples delivered to Earth by NASA’s OSIRIS-REx mission, strengthening the case that life’s building blocks originated in space. 🧪⚛️ physicsworld.com/a/components...

12.12.2025 11:45 👍 31 🔁 13 💬 0 📌 0
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Astronomers observe a coronal mass ejection from a distant star – Physics World Burst from M-dwarf star could be powerful enough to strip the atmosphere of any planets that orbit it, with implications for the search for extraterrestrial life

For the first time, astronomers have detected a coronal mass ejection from a star other than our Sun, and it was a big one – powerful enough to strip the atmosphere from nearby planets. That's bad news for the search for extraterrestrial life. Here's why: physicsworld.com/a/astronomer... 🧪⚛️🔭

11.12.2025 09:10 👍 125 🔁 41 💬 6 📌 11
Interstellar visitor 3I/ATLAS: expert breaks down the REAL science
Interstellar visitor 3I/ATLAS: expert breaks down the REAL science YouTube video by ESO Chasing Starlight

Great job, #Juice! If you’re curious to know more about 3I/ATLAS, check out this episode of Chasing Starlight, where we separate science from science fiction: www.youtube.com/watch?v=Ytiq...

05.12.2025 13:56 👍 2 🔁 1 💬 0 📌 0
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Science e-Books - NASA Science From Earth and the other planets in our solar system, to supermassive black holes and the distant galaxies that contain them, explore NASA science and imagery through our library of e-books.

Today I learned that NASA has a collection of free ebooks that can be downloaded as pdfs or ebub format.

The science books even include a children’s section with fun activites and coloring books!

science.nasa.gov/multimedia/s...

04.12.2025 14:43 👍 520 🔁 302 💬 13 📌 10
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Formation of oceans within icy moons could cause the waters to boil A rigid ice shell over a shrinking interior makes for pressures low enough to boil.
25.11.2025 12:19 👍 29 🔁 6 💬 3 📌 3
The Uranus and Neptune systems as seen by JWST/NIRCam (Credit:  NASA, ESA, CSA, STScI; Image Processing: Joseph DePasquale).  Uranus and its classical satellites are shown on the left against a background of galaxies; Uranus and Neptune are shown on the right replete with reflective rings and clouds.  NIRSpec and MIRI will be used to provide full spectroscopy of the Uranus and Neptune atmospheres.

The Uranus and Neptune systems as seen by JWST/NIRCam (Credit: NASA, ESA, CSA, STScI; Image Processing: Joseph DePasquale). Uranus and its classical satellites are shown on the left against a background of galaxies; Uranus and Neptune are shown on the right replete with reflective rings and clouds. NIRSpec and MIRI will be used to provide full spectroscopy of the Uranus and Neptune atmospheres.

🔭🧪🎢 PhD Project focus: Exploring the Atmospheres of Uranus & Neptune with JWST

We're advertising this project with Prof Leigh Fletcher, using infrared spectral data to investigate the changing atmospheres of the ice giants

For details of all our PhD projects look here: le.ac.uk/study/resear... 🔭🧪🎢

18.11.2025 16:33 👍 8 🔁 4 💬 0 📌 1

Journalist challenge: Use “Machine Learning” when you mean machine learning and “LLM” when you mean LLM. Ditch “AI” as a catch-all term, it’s not useful for readers and it helps companies trying to confuse the public by obscuring the roles played by different technologies. 🧪

22.11.2025 16:50 👍 3709 🔁 1372 💬 58 📌 128
Artist's impression of Saturn's icy moon Enceladus, which has a frozen surface covering a deep ocean. Jets of water burst from cracks close to the moon's south pole.

Artist's impression of Saturn's icy moon Enceladus, which has a frozen surface covering a deep ocean. Jets of water burst from cracks close to the moon's south pole.

Saturn's moon #Enceladus is a top target for us in our #Voyage2050 long-term planning period.

No space agency has ever landed on Enceladus. And yet this moon has enormous potential for new science, particularly in the realm of habitability.

1/ #CM25 🔭

21.11.2025 13:10 👍 215 🔁 41 💬 4 📌 5
A group of 16 people wearing white cleanroom suits pose for a photo inside a bright laboratory. They are standing and kneeling in front of a large spacecraft covered in shiny silver and gold thermal material, mounted on a vertical support structure. Some team members wear masks, and the background shows technical equipment and cleanroom walls.

A group of 16 people wearing white cleanroom suits pose for a photo inside a bright laboratory. They are standing and kneeling in front of a large spacecraft covered in shiny silver and gold thermal material, mounted on a vertical support structure. Some team members wear masks, and the background shows technical equipment and cleanroom walls.

🆕 #Smile passes qualification & flight acceptance review, meeting all requirements for launch.
🚀 The joint European-Chinese mission will launch on a Vega-C rocket from Europe's spaceport in French Guiana.
📆 Launch window is set for 8 April to 7 May 2026.
Find out more👉 www.esa.int/Science_Expl...
🧪☀️

20.11.2025 13:04 👍 59 🔁 12 💬 1 📌 5

So true! Yet, while frustrating, I always found these reviewers comments super useful and sometimes enlightening.

31.10.2025 19:31 👍 1 🔁 0 💬 0 📌 0
Artist's impression of ESA's Jupiter Icy Moons Explorer (Juice) spacecraft

Artist's impression of ESA's Jupiter Icy Moons Explorer (Juice) spacecraft

Interstellar comet 3I/ATLAS seen by the NASA/ESA Hubble Space Telescope

Interstellar comet 3I/ATLAS seen by the NASA/ESA Hubble Space Telescope

ESA’s Jupiter Icy Moons Explorer (Juice) spacecraft is ready to aim its instruments at interstellar comet 3I/ATLAS! 🪐☄️

Here’s what’s happening and why it’s such a rare opportunity 🧵

24.10.2025 14:21 👍 186 🔁 61 💬 6 📌 3

Just the boy?

05.10.2025 16:36 👍 0 🔁 0 💬 1 📌 0
Small preview of color photographic map of Pluto in Mollweide oblique projection. It contains one large global map with four small hemispheric maps and basic description. Full version of this map is available for download in links in the main post.
Credit: NASA/JHU-APL/SwRI/Marc W. Buie/ESA/Daniel Machacek.

Small preview of color photographic map of Pluto in Mollweide oblique projection. It contains one large global map with four small hemispheric maps and basic description. Full version of this map is available for download in links in the main post. Credit: NASA/JHU-APL/SwRI/Marc W. Buie/ESA/Daniel Machacek.

My new color photographic map of Pluto is now online.

Full resolution image version (~322Mpix) is available on Flickr www.flickr.com/photos/10958...
PDF version (~73MB) is available here: drive.google.com/file/d/1EW-x...

🧵 1/5

01.10.2025 03:42 👍 282 🔁 64 💬 5 📌 7