| Astrophysics (Index) | About |
The term exo-Earth (or exoearth, and another such term is Earth analog) is used to indicate an Earth-like extra-solar planet, e.g., a rocky planet with a mass not much different than Earth's. A planet which has been so-referenced is Ross 128 b, whose mass is not fully determined, but might be no more than 35% larger than Earth's, which would be close, given the wide range of planet masses.
The term super-Earth has been cited as applicable to planets substantially larger than Earth, up to perhaps 10 times Earth mass.