terrestrial planet; rocky planet
Astronomical term for a planet with a solid rocky surface, as opposed to a gas giant. Synonymous with 地球型惑星.
See also: 地球型惑星 (ちきゅうがたわくせい)
Earth and Mars are classified as terrestrial planets.
The four terrestrial planets in the solar system are Mercury, Venus, Earth, and Mars.
Compound of 固体 (solid) and 惑星 (planet), a straightforward modern scientific term.