Class B - Geomorteus
Age: 0-10 billion years
Diameter: 1,000 - 10,000 km
Location: Hot Zone
Surface: Partially molten, high surface temperature
Atmosphere: Extremely tenuous, few chemically active gases
Life-Forms: None known
Class B planets are found in a star's hot zone. Smaller than Earth, they range in size from 1,000 to 10,000 kilometers in diameter. Due to their close proximty to a star they have a high surface temperature, and an extremely tenuous atmosphere with few chemically active gases.
The planet Mercury in the Earth's star system is a Class B planet.