Tag

Rocky Planet

All articles tagged with #rocky planet

space14 days ago•3 min saved

Dense Mega-Earth GJ 523b Defies Conventional Planet Formation

Astronomers confirm GJ 523b, a rock-dominated mega-Earth about 23 Earth masses and 2.5 Earth radii in a 170-million-year-old system, orbiting its star every 17.75 days. Its extreme density and thin atmosphere challenge standard models that would normally push such a core to become a gas giant, prompting theories like atmospheric stripping from stellar heat or a head-on collision of rocky protoplanets. This discovery provides a rare glimpse into how ultra-dense worlds form and evolve.

via geekspin|

#exoplanet #gj-523b #mega-earth

space1 month ago•5 min saved

Helium Signals Long-Lived Atmosphere on Rocky Exoplanet in Habitable Zone

Astronomers detected a helium escape signal from LHS 1140 b, a rocky planet in its star’s habitable zone about 48 light-years away, confirming it retains an atmosphere that may have persisted for billions of years and making it a prime target for studying Earth-like atmospheres from the ground.

via ScienceDaily|

#atmosphere #exoplanet #habitable-zone

science2 months ago•11 min saved

Nearby 25-light-year world now looks rocky after mass reestimate

Astronomers have revised the mass of the nearby exoplanet Gliese 3378 b down to about 2.3 Earth masses, shifting it from the edge of a mini-Neptune into the rocky regime. Its 21.45-day orbit places it in the star’s habitable zone at roughly 25 light-years away, making it a promising candidate for a rocky world; however, the existence of a solid surface or an atmosphere—and thus true habitability—still requires confirmation.

via Space Daily|

#exoplanet-mass #gliese-3378-b #habitable-zone

space3 years ago•11 min saved

James Webb Telescope Discovers Surprising Atmosphere on TRAPPIST-1 C Exoplanet

NASA's James Webb Space Telescope has discovered that TRAPPIST-1 c, a rocky exoplanet orbiting a red dwarf star, does not have a thick carbon dioxide atmosphere, making it unlikely to be a Venus analog. The planet, which has the coolest measured temperature for a rocky exoplanet, might have formed with minimal water content. It either lacks an atmosphere or possesses a very thin one, and further research will investigate temperature variations on the planet and continue studying potential atmospheric conditions.

via SciTechDaily|

#atmosphere #exoplanet #james-webb-space-telescope

astronomy3 years ago•7 min saved

Rocky exoplanet unlikely to have thick CO2 atmosphere, says Webb.

NASA's James Webb Space Telescope has measured the heat radiating from TRAPPIST-1 c, an exoplanet orbiting a red dwarf star 40 light-years from Earth. The result suggests that the planet's atmosphere, if it exists at all, is extremely thin. TRAPPIST-1 c is one of seven rocky planets orbiting an ultracool red dwarf star, and the result marks another step in determining whether planets orbiting small red dwarfs like TRAPPIST-1 can sustain atmospheres needed to support life as we know it.

via Phys.org|

#astronomy #atmosphere #exoplanet

science3 years ago•4 min saved

Possible Signs of Water Vapor Found in Nearby Star System by Webb Telescope

The James Webb Space Telescope has detected water vapor around a rocky exoplanet that orbits a star located 26 light-years away from Earth. Astronomers are trying to determine whether that water vapor is an indicator of what would be the first-known presence of an atmosphere around a rocky exoplanet. The presence of water vapor could suggest that the exoplanet somehow has an atmosphere, despite its heat and proximity to the star. However, astronomers are taking care with their interpretation of the findings because it’s possible that the water vapor is connected to the star itself.

via CNN|

#atmosphere #exoplanet #james-webb-space-telescope