#exoplanet — Public Fediverse posts

https://www.europesays.com/ch/125890/ The SETI Institute And ETH Zurich Join Forces To Search For The Origin Of Life #astrobiology #Astronomy #ETHZurich #exoplanet #OriginOfLife #SETIInstitute #Zürich

#AIP:
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Sterneruptionen im Labor: Erster experimenteller Nachweis für deren Unterdrückung durch starke Magnetfelder
"
".. Nachweis erbracht, dass starke Magnetfelder aktiver Sterne koronale Massenauswürfe vollständig unterdrücken können. .. erklärt, warum massereiche stellare Eruptionen bei Sternen viel seltener beobachtet werden als bei der Sonne. .."

https://www.aip.de/de/news/stellar-eruptions-laboratory-experiment/

21.8.2026

#Astrophysik #CME #Exoplanet #KoronalerMassenauswurf #Magnetfeld #Plasma #Simulation #Stern #Sterneruption

White Paper Makes the Case for a European Exoplanet Interferometer

Like and share if you enjoyed this.

https://1ban.news/life-mission-exoplanet-atmospheres/

#1ban #life #mission #exoplanet #atmospheres #space

Working on The Nancy Grace Roman Space Telescope - Long Exposure Timelapses

#Cleanroom #Exoplanet #ExoplanetAtmospheres #NancyGraceRomanSpaceTelescope #Spectrum #TimeLapse

⏩ 2 new pictures and 2 new videos from NASA (SVS) https://commons.wikimedia.org/w/index.php?search=incategory%3A%22NASA+SVS+files+uploaded+by+OptimusPrimeBot%22&sort=create_timestamp_desc&ns6=1

RE: https://mastodon.social/@proseandpassion/116935425709917770

Where in #space can #planets with #atmospheres be found? C. Cherubim et al. (2026) used #nearinfraredspectroscopy to characterize a #rocky #exoplanet orbiting its host star within the #habitablezone. Planet #LHS1140b exhibits #helium #absorption in its atmosphere, a feature the authors attribute to a helium-dominated #upperatmosphericlayer.

© #StefanFWirth, July 2026, Berlin

Reference
C. Cherubim et al. (2026)
https://doi.org/10.1126/science.aea9708

Circling Exoplanet 48539 is the -now defunct- experimental FTL (Faster Than Light) technology centre. With a circumference of over 85 kilometres, this particle accelerator helped to prove the underlying principles of how my ship works. Don’t ask me to describe it, it’s something to do with particles repelling, attracting and opposites together on the other side of the galaxy, all at the same time. But then again, it’s not complicated at all, I just push this button and it jumps.

#scifi #exoplanet #MicroFiction #acorn #spring #nature #photography

The cosmic shoreline concept was introduced to separate #planets with #atmospheres from those without, by relating the cumulative X-ray and extreme-ultraviolet (XUV) instellation to the planetary escape velocity, using the Solar System planets to anchor the empirical relation.

The #exoplanet community has since attempted to refine the cosmic shoreline to provide a consistent ranking or prioritisation tool for exoplanet observations – i.e., to quickly identify which small #planets are most likely to have retained an #atmosphere.

In a new paper, astronomers use an empirical approach to refine the cosmic shoreline concept.

The Empirical Exoplanet Cosmic Shoreline (EECS) exhibits a significantly steeper slope than previously theorized, while consistently categorising Solar System moons and dwarf planets according to their atmospheric properties.

Applied to planets orbiting M dwarfs, the EECS suggests that a larger fraction retain atmospheres than predicted by classical models, but incorporating revised XUV fluence histories for low-mass M dwarfs reveals severe atmospheric vulnerability.

#astronomy #astrobiology
https://astrobiology.com/2026/06/an-empirical-determination-of-the-cosmic-shoreline-2.html

Paper by Meni-Gallardo & Pallé (2026):
https://arxiv.org/abs/2508.12865

A Final Look at The Roman Space Telescope's Primary Mirror: Beauty Shots 🌑🛰️🧑‍🚀

#Africa #Artemis #Astronaut #Cleanroom #EarthScience #Exoplanet #ExoplanetAtmospheres #Hardware

⏩ 5 new pictures and 8 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=31&user=OptimusPrimeBot&ilshowall=1&offset=20260423175839

Webb redefines dividing line between planets and stars

#29cygnib #canadianspaceagency #cosmos #csa #esa #esawebb #europeanspaceagency #exoplanet

▶️ 1 new picture from ESA (Flickr) https://commons.wikimedia.org/wiki/File:Webb_redefines_dividing_line_between_planets_and_stars_%2855207533974%29.jpg

Here is a problem that has been quietly gnawing at astronomers for decades.

The standard approach to detecting #life on other worlds involves scanning #exoplanet #atmospheres for #oxygen, #methane, and #ozone, whose presence is difficult to explain without #biology.

It's a clever idea, but it carries a hidden flaw. That entire shopping list was written by studying Earth. It is, inevitably, a search for life like us.

The list of ways that #chemistry alone can accidentally mimic these #biosignature gases is growing faster than the list of new ways to detect life.

Each new false positive scenario demands even more information about the #planet to rule it out, and there is a genuine question about whether that information can ever be gathered exhaustively.

But there is a solution.

#Assembly theory doesn't ask what #molecules are present in an #atmosphere. Instead, it asks how hard they were to make.

Every molecule can be assigned an assembly index, a minimum number of construction steps required to build it from basic #chemical building blocks.

Simple molecules are easy to assemble by chance, but truly complex ones, requiring many sequential steps, don't arise without something doing a great deal of deliberate selection.

That something would then be life itself.

#astrobiology #astronomy
https://phys.org/news/2026-03-life.html

Paper by Walker et al. (2026): https://arxiv.org/abs/2603.11086

23 Years of Sea Surface Temperature (SST) - 2002-2025

#Exoplanet #ExoplanetAtmospheres #Oceans #Spectrum #seasurfacetemperature

⏩ 2 new pictures and 2 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=14&user=OptimusPrimeBot&ilshowall=1&offset=20260127203610

Viewing an Exoplanet Transmission Spectrum 🛰️

#Exoplanet #ExoplanetAtmospheres #Fleet #Heliopause #Heliophysics #Heliosphere #Magnetopause #Magnetosphere

⏩ 3 new pictures and 3 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=22&user=OptimusPrimeBot&ilshowall=1&offset=20260128125704

23 Years of Sea Surface Temperature (SST) - 2002-2025 ✨🛰️

#Ast #Astrophysics #BlackHole #EnergeticNeutralAtoms(ENA) #Exoplanet #ExoplanetAtmospheres #Fleet #GalacticCosmicRays

⏩ 5 new pictures and 4 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=39&user=OptimusPrimeBot&ilshowall=1&offset=20260127203610

Viewing an Exoplanet Transmission Spectrum 🛰️

#EarthScience #Exoplanet #ExoplanetAtmospheres #Fleet #GPS #GeomagneticStorm #Heliopause #Heliophysics

⏩ 2 new pictures and 3 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=25&user=OptimusPrimeBot&ilshowall=1&offset=20260127125926

Viewing an Exoplanet Transmission Spectrum ☄️

#CME #Comet #CometTail #CoronalMassEjections #EarthScience #Exoplanet #ExoplanetAtmospheres #Heliophysics

⏩ 1 new picture and 2 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=7&user=OptimusPrimeBot&ilshowall=1&offset=20260123173804

Viewing an Exoplanet Transmission Spectrum

#Exoplanet #ExoplanetAtmospheres #Spectrum

⏩ 1 new picture and 1 new video from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=6&user=OptimusPrimeBot&ilshowall=1&offset=20260121201514

Extreme Mass Ratio Black Hole Inspirals (EMRIs)

#BlackHole #ComputerModel #Ergosphere #Exoplanet #ExoplanetAtmospheres #Inspiral #Spectrum

⏩ 2 new pictures and 2 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=36&user=OptimusPrimeBot&ilshowall=1&offset=20260121201514

We live in a very exciting time: answers to some of the oldest questions humanity has conceived are within our grasp.

One of these is whether #Earth is the only place that harbours #life.

In the last 30 years, the question of whether the Sun is unique in hosting a planetary system has been resoundingly answered: we now know of thousands of #exoplanets orbiting other #stars.

But can we use telescopes to detect whether any of these distant worlds also harbour life?

A promising method is to analyse the gases present in the #atmospheres of these #planets.

Astonishingly, we can identify #molecules present in the atmospheres of exoplanets.

Quantum mechanics causes each atmospheric chemical to have its own distinct barcode-like pattern, which it leaves on the light passing through it.

By collecting starlight that has been filtered through an #exoplanet’s atmosphere, telescopes can see the barcodes of the molecules making up that atmosphere.

To take advantage of this, the planet needs to #transit – pass in front of – the star from our point of view.

#astronomy #astrobiology
https://theconversation.com/how-astronomers-plan-to-detect-the-signatures-of-alien-life-in-the-atmospheres-of-distant-planets-272821

NASA’s Pandora Satellite to Explore Exoplanets and Stars ✨

#Ast #Astrophysics #CoronalMassEjections #Exoplanet #ExoplanetAtmospheres #GeomagneticStorm #Graphics #Heliophysics

⏩ 3 new pictures and 2 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=15&user=OptimusPrimeBot&ilshowall=1&offset=20260110125858

Small #planets have nearly circular orbits, while giant planets have orbits about four times more elliptical.

The finding points toward two different pathways by which large and small planets form.

The #eccentricity split coincides with several other iconic features in the #exoplanet population, such as the high abundance of small planets over large planets and a tendency for giant planets to form only around #stars enriched in heavy elements.

#astronomy #exoplanets
https://astrobiology.com/2025/03/small-and-large-planets-have-significantly-different-upbringings.html

Astronomers have confirmed the existence of #exoplanet Gaia-4b—one of the most massive #planets known to orbit a low-mass #star.

Gaia-4b is also the first #planet detected by the #Gaia spacecraft using the #astrometric technique.

The newly discovered exoplanet, named Gaia-4b, has an orbital period of 570 days and a mass of 12 Jupiter masses and orbits a star 64% of the mass of the sun.

#astronomy
https://phys.org/news/2025-02-high-precision-spectrograph-massive-exoplanet.html

Transiting #Exoplanet Survey Satellite is not only good at detecting #exoplanets.

Here are 11 new transiting brown dwarfs and very low-mass #stars from #TESS consisting of 5 brown dwarf companions and 6 very low mass stellar companions ranging in mass from 25 to 128 Jupiter masses.

The #eccentricity distribution for the transiting brown dwarf sample does not support previous claims of a transition between planetary and stellar formation at ∼42 Jupiter masses.

https://astrobiology.com/2025/01/11-new-transiting-brown-dwarfs-and-very-low-mass-stars-from-tess.html

#Spektrum:

"Weiße Zwerge: Exoplanet gibt Ausblick auf Schicksal der Erde"

"Das Ende unserer Erde ist vorbestimmt: Sie wird eines Tages von der sich aufblähenden Sonne verschluckt. Aber was passiert, wenn diese dann schrumpft?"

https://www.spektrum.de/news/weisse-zwerge-exoplanet-gibt-ausblick-auf-schicksal-der-erde/2234550

https://arxiv.org/html/2409.02157v1

27.9.2024

#Astronomie #Erde #Exoplanet #RoterRiese #WeißerZwerg

Bisher ist strittig, ob die Erde das Ende der Sonne überstehen oder von ihr verschlungen wird. Ein erdähnlicher Exoplanet bei einem Weißen Zwerg macht nun Hoffnung. #Exoplanet #RoterRiese #Astronomie #Erdzerstoerung #Sonnentod #KB200414Lb
https://www.scinexx.de/news/kosmos/exoplanet-verraet-schicksal-der-erde/

Neues Rätsel um „untoten“ Planet: Eine Sternverschmelzung kann die Rettung von 8 Ursa Minoris b vor dem Verschlingen nicht erklären - aber was dann? #Exoplanet #8UMinb #Astronomie #Stern #RoterRiese #Planet
https://www.scinexx.de/news/kosmos/neues-raetsel-um-untoten-planet/

Direct Imaging and #Astrometric Discovery of a #Superjovian Planet Orbiting an Accelerating Star: https://arxiv.org/abs/2212.00034 -> over a year of reviewing and revising - but "no changes in conclusions" - before formal publication -> Wobbling star found in Gaia-Hipparcos data confirmed to host #exoplanet: https://www.esa.int/Science_Exploration/Space_Science/Gaia/Wobbling_star_found_in_Gaia-Hipparcos_data_confirmed_to_host_exoplanet