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.
Means 'solid planet', sometimes used to contrast with gas giants.
固体惑星はガス惑星と異なり、表面が固体である。
Solid planets, unlike gas planets, have a solid surface.
A non-technical way to describe a planet like Earth.
Means 'a planet like Earth', easily understood in general conversation.
地球のような惑星は生命が存在する可能性がある。
Planets like Earth may have the potential for life.
The most common and standard term in astronomy.
地球型惑星は主に岩石や金属でできている。
Terrestrial planets are mainly made of rock and metal.
Literally 'rocky planet', used in scientific contexts.
太陽系には4つの岩石惑星がある。
There are four rocky planets in the solar system.
Literally 'a planet made of rock', a clear descriptive phrase.
岩石でできた惑星はガスでできた惑星より密度が高い。
Planets made of rock are denser than planets made of gas.