巨きょ大だいガス惑わく星せい

noun

gas giant

Astronomy term for a large planet composed mainly of hydrogen and helium, such as Jupiter or Saturn. Synonymous with 木星型惑星.

See also: 木星型惑星

• 木もく星せいは太たい陽よう系けい最さい大だいの巨きょ大だいガス惑わく星せいです。

  Jupiter is the largest gas giant in the solar system.

• 巨きょ大だいガス惑わく星せいには固こ体たいの表ひょう面めんがありません。

  Gas giants do not have a solid surface.