Agi: Scoperto un esopianeta roccioso senza atmosfera né acqua
AGI - Un esopianeta roccioso vicino alla Terra presenta una superficie scura, calda e priva di atmosfera, probabilmente composta da rocce basaltiche e povera d'acqua, offrendo nuovi indizi sulla geologia dei pianeti extrasolari. E' quanto emerge da uno studio pubblicato su Nature Astronomy e guidato da Sebastian Zieba del Center for Astrophysics | Harvard & Smithsonian e da Laura Kreidberg del Max Planck Institute for Astronomy.
I ricercatori hanno analizzato il pianeta LHS 3844 b utilizzando lo strumento MIRI a bordo del telescopio spaziale James Webb, studiando la radiazione infrarossa emessa dalla sua superficie. I risultati indicano che il pianeta, circa il 30% più grande della Terra e situato a 48,5 anni luce di distanza, è privo di atmosfera e presenta una superficie simile a quella della Luna o di Mercurio. LHS 3844 b orbita molto vicino alla sua stella e mostra sempre la stessa faccia illuminata, con temperature medie di circa 1000 Kelvin.
L'analisi
L'analisi spettrale ha escluso una composizione simile alla crosta terrestre, ricca di silicati come il granito, suggerendo invece la presenza di materiali basaltici ricchi di ferro e magnesio. "Grazie alla straordinaria sensibilità del James Webb, possiamo rilevare la luce proveniente direttamente dalla superficie di questo pianeta roccioso distante", afferma Kreidberg, sottolineando che si tratta di "una roccia calda e priva di atmosfera".
Secondo i ricercatori, l'assenza di una crosta simile a quella terrestre implica che processi come la tettonica a placche, che richiedono acqua, siano assenti o inefficaci su questo pianeta.
I due scenari
L'interpretazione dei dati suggerisce due possibili scenari: una superficie relativamente giovane modellata da attività vulcanica recente oppure una superficie più antica, alterata nel tempo da fenomeni di "space weathering" dovuti a radiazioni e impatti meteoritici. L'assenza di segnali di gas come l'anidride solforosa, tipicamente associata al vulcanismo, rende più probabile la seconda ipotesi. Gli autori stanno già conducendo ulteriori osservazioni per distinguere tra queste possibilità e migliorare la comprensione delle superfici rocciose degli esopianeti.
An Earth-like rocky exoplanet without an atmosphere or water has been discovered.
AGI - A rocky exoplanet near Earth exhibits a dark, hot, and atmosphere-free surface, likely composed of basaltic rocks and poor in water, offering new clues about the geology of extrasolar planets. This is the finding of a study published in Nature Astronomy and led by Sebastian Zieba of the Center for Astrophysics | Harvard & Smithsonian and Laura Kreidberg of the Max Planck Institute for Astronomy.
The researchers analyzed the planet LHS 3844 b using the MIRI instrument aboard the James Webb Space Telescope, studying the infrared radiation emitted from its surface. The results indicate that the planet, about 30% larger than Earth and located 48.5 light-years away, is atmosphere-free and has a surface similar to that of the Moon or Mercury. LHS 3844 b orbits very close to its star and always shows the same illuminated side, with average temperatures of approximately 1000 Kelvin.
The analysis
The spectral analysis ruled out a composition similar to Earth’s crust, rich in silicates like granite, instead suggesting the presence of iron- and magnesium-rich basaltic materials. "Thanks to the extraordinary sensitivity of the James Webb, we can detect the light coming directly from the surface of this distant rocky planet," says Kreidberg, emphasizing that it is “a hot rock and atmosphere-free.”
According to the researchers, the absence of an Earth-like crust implies that processes such as plate tectonics, which require water, are absent or ineffective on this planet.
The Two Scenarios
The interpretation of the data suggests two possible scenarios: a relatively young surface shaped by recent volcanic activity, or an older surface altered over time by “space weathering” phenomena due to radiation and meteorite impacts. The absence of signals of gases such as sulfur dioxide, typically associated with volcanism, makes the second hypothesis more probable. The authors are already conducting further observations to distinguish between these possibilities and improve the understanding of the rocky surfaces of exoplanets.
#Earth #SebastianZieba #LauraKreidberg #LHS3844 #about30% #Mercury #JamesWebb #Kreidberg #second
https://www.agi.it/scienza/news/2026-05-06/scoperto-esopianeta-roccioso-36900584/
2026-05-04 13:00:00 UTC (Delta: 2026-04-27)
WHERE IS BEPI?
- Barycentric speed: 54.53 km/s (+4.85 km/s)
- Mercury Orbit Insertion in: 200 days
⚪ Relative to Mercury
- Distance (km): 19,047,540.03 km (+1,584,603.06 km)
- Distance (AU): 0.13 (+0.01)
- Light travel time: 1 min 3.54 s (+5.29 s)
🌎 Relative to Earth
- Distance (km): 198,088,960.65 km (+7,261,251.07 km)
- Distance (AU): 1.32 (+0.05)
- Light travel time: 11 min 0.77 s (+24.22 s)
2026-05-04 12:00:00 UTC (Delta: 2026-04-27)
MERCURY
- Distance (km): 192,075,087.20 km (+10,991,460.24 km)
- Distance (AU): 1.28 (+0.07)
- Light travel time: 10 min 40.69 s (+36.66 s)
- Orbital speed: 51.74 km/s (+5.10 km/s)
Image: Caloris Basin - in Color!
Credit: NASA
A Couple Million Lines of Haskell: Production Engineering at Mercury
https://blog.haskell.org/a-couple-million-lines-of-haskell/
#HackerNews #Haskell #ProductionEngineering #Mercury #SoftwareDevelopment #FunctionalProgramming
A Couple Million Lines of Haskell: Production Engineering at Mercury
💥 Explore this insightful post from Hacker News 📖 📂 **Category**: ✅ **What You’ll Learn**: Ian Duncan March 30, 2026 #Production #Mercury The editors of the Haskell Blog are happy to announce a new series of articles called "Haskellers from the trenches", where we invite experienced engineers to talk about their subjects of expertise, best practices, and production tales. Engineering rigour and…
https://viralpique.com/a-couple-million-lines-of-haskell-production-engineering-at-mercury/

💥 Explore this insightful post from Hacker News 📖 📂 **Category**: ✅ **What You’ll Learn**: Ian Duncan March 30, 2026 [Haskellers from the trenches] #Production #Mercury The editors of the Haskell Blog are happy to announce a new series of articles called "Haskellers from the trenches", where we invite experienced engineers to talk about their