天てん王のう星せい型がた惑わく星せい

noun

ice giant

Astronomical term for a type of planet like Uranus and Neptune, characterized by a thick atmosphere of hydrogen, helium, and ices such as water, ammonia, and methane. Contrasts with 木星型惑星 (gas giant).

See also: 木星型惑星

• 天てん王