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Planetary atmospheres
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Planetary atmospheres

An atmosphere is a layer of gases surrounding a planet, held by gravity. Think of it as a "blanket" or "skin." In our solar system, every planet has a different style: Mercury is nearly bare, while Venus has a thick, suffocating blanket of clouds. Earth has the perfect balance for life, whereas gas giants like Jupiter are essentially giant atmospheres with no solid surface. They protect us from radiation and regulate temperature.
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Latest news from Planetary atmospheres

Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
iconToday
iconStars | Exoplanets | Planetary atmosphere
Image: Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
A new method for analyzing light from distant planets allows for a detailed look at their atmospheres by comparing the leading and trailing edges of the planet. This technique addresses a common problem where previous methods created misleading data by treating these edges as linked. By focusing on the timing of when a planet crosses its star, the new framework provides a clearer picture of atmospheric composition and temperature without the biases found in older models. This approach significan...
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Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconYesterday
iconStars | Exoplanets | Hot Jupiter | Planetary atmosphere
Image: Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
New observations of hot Jupiter KELT-2A b confirm water vapor in its atmosphere. The planet shows a carbon-to-oxygen ratio similar to its host star but with overall lower metallicity, suggesting a complex migration history from far out in its star system....
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Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
iconYesterday
iconStars | Exoplanets | Red dwarfs | Super-Earths | Planetary atmospheres | TESS
Image: Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
The exoplanet TOI-2257 b orbits its star once every 35 days with a high eccentricity. New models suggest its atmospheric and orbital fate depends on whether it is a gas-rich mini-Neptune or a rocky super-Earth. Higher eccentricity would confirm a gaseous nature....
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Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
icon14. 10. 2026
iconStars | Exoplanets | Hot Jupiter | Planetary atmosphere
Image: Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
Researchers have detected metastable helium escaping from the ultrahot Jupiter KELT-18 b. This confirms the massive gas giant is undergoing active atmospheric photoevaporation. KELT-18 b is now the most massive planet found with this specific helium signature....
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Atmospheric limb of WASP-17 b reveals significant temperature differences
icon14. 10. 2026
iconStars | Exoplanets | Hot Jupiter | Planetary atmosphere
Image: Atmospheric limb of WASP-17 b reveals significant temperature differences
A new spatial map of the hot Jupiter WASP-17 b reveals a 650 K temperature difference between its morning and evening atmosphere. The study used transmission string mapping to confirm atmospheric chemical stability and global circulation patterns....
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