Astrophysics (index)

Water Vapor Planet

(Steam Planet)
(planet showing water vapor in its atmosphere)

Water Vapor Planet most likely refers to an Extra Solar Planet in which water vapor has been detected in its Atmosphere. (As such, Earth might qualify.) Another term is Steam Planet, which might more likely be used if the Temperature appears to be in the range of steam at an ATM, i.e., steam as we are used to it, or if the atmosphere is primarily water vapor (e.g., a Steam Atmosphere).

The terms may also be used for extreme theoretical homogeneous planets that are not conceived to exist but are for comparison with the apparent density of some observed exoplanet, i.e., a theoretical planet composed basically of water vapor, with or without a small core.

(planet type,water)