Translation guide
A planet with a solid, rocky surface, like Earth or Mars, as opposed to a gas giant.
Referring to a terrestrial planet with a solid surface composed primarily of silicate rocks or metals.
Standard astronomical term for a rocky or terrestrial planet. Used in scientific contexts and general discussions.
地球は岩石惑星です。
Earth is a rocky planet.
太陽系には4つの岩石惑星があります。
There are four rocky planets in the solar system.
Means 'solid planet', emphasizing the solid state as opposed to gaseous. Less common, but understandable.
木星は固体惑星ではありません。
Jupiter is not a solid planet.
Literally 'Earth-type planet', a common synonym for terrestrial planet. Slightly more formal or academic.
火星は地球型惑星に分類されます。
Mars is classified as a terrestrial planet.