noun
major planet
General term for a large planet, often used in contrast to minor planets or asteroids. In modern astronomy, it can refer to the eight planets of the solar system.
太陽系の大惑星は全部で八つある。
There are eight major planets in the solar system.
noun
giant planet; Jovian planet
Specifically refers to the large gas or ice giants like Jupiter and Saturn, as opposed to terrestrial planets. Used in planetary science contexts.
See also: 木星型惑星
木星は代表的な大惑星だ。
Jupiter is a typical giant planet.