气态巨星

气态巨星是行星等级中的B级（Class B）行星，与 Class A （气态超巨星）行星相似, 出现在恒星系中的 "冷区"比 Class A 行星略小, 直径通常在 50,000~140,000 公里地核温度高但辐射的热量不如 Class A 行星那么多行星表面同样充满氢气及其化合物, 导致低辐射及强大重力典型的 Class B 行星是土星

Class B (Gas Giant):

Class B planets, like Class A planets, are also found in a star's

"cold zone". They are smaller than Class A planets and are usually between

50,000 and 140,000 kilometers in diameter. They have high core temperatures

but do not radiate as much heat as Class A planets. Their surface is also

composed from gaseous hydrogen and hydrogen compounds, due to the low stellar

radiation and high planet gravity. An example of a Class B planet is Saturn.