Astrophysics (index)about

Planet Type

(methods of classifying planets)

A number of short phrases have come into use to describe various Extra-Solar Planets that could be termed Planet Types. The planets Earth, Jupiter, and Neptune are often used to designate the size as are Super-Earth and Mega-Earth, the latter two which may simply designate the size or may also suggest it is rocky.

The adjectives hot and warm are added to designate a planet closer to the star than its Habitable Zone, e.g., a planet with a week-long orbit around a Sun-like star.

The terms gas planet, liquid planet, and rocky planet are used to designate its primary constituents. Hot typically means very close to the star, perhaps an orbit of a few days and Temperatures in thousands of degrees. Warm has been used for planets with close to Earth temperatures or for considerably warmer.



Referenced by:
Water-Ice Planet