Translation guide
A terrestrial planet is a rocky planet like Earth, Mercury, Venus, or Mars. In Japanese, this is expressed with specific scientific terms or descriptive phrases.
The standard astronomical term for a rocky planet.
A non-technical way to describe a planet like Earth.
Means 'a planet like Earth', easily understood in general conversation.
Literally 'rocky planet', used in scientific contexts.
There are four rocky planets in the solar system.
Solid planets, unlike gas planets, have a solid surface.
Planets like Earth may have the potential for life.
Literally 'a planet made of rock', a clear descriptive phrase.
Planets made of rock are denser than planets made of gas.