Class A gas giant

In planetary classification, a class A gas giant is a type of planet. As the name describes, the planet is generally composed of a tenuous gas concentration, with or without a solid subsurface or core. In many cases, methane composes a significant amount of the planetary atmosphere. In particular among gas giant planets, the class A worlds of this type are radiant of heat and some energy, differing in this respect from the class B gas giant. 


 * This classification should not be confused with the class A described in .