K2-18 b
sub-Neptune in the habitable zone · studied by JWST
124 light-years from Earth
A world 2.6 times Earth's width and 8.6 times its mass, orbiting where its star's warmth could allow liquid water. In 2023 JWST found methane and carbon dioxide in its hydrogen-rich air, and it may hide a deep ocean. A claimed hint of dimethyl sulfide, a gas that on Earth comes only from living things, has not been confirmed, and it can also form without life.
- orbit 33 days (sped up here) at 0.16 AU · 124 light-years
- JWST measured its gases, not its looks: the colours are a guess
- kind
- planet of another star
- size
- 33,300 km across
More planets of other stars
- HR 8799 b young giant planet
- HD 189733 b the deep blue planet
- Kepler-16b circumbinary planet
- 51 Pegasi b the first planet found around a Sun-like star
- 55 Cancri e lava world
- TRAPPIST-1e exoplanet
- KELT-9b the hottest planet known
- Proxima b exoplanet