Description: Giant ice
Surface: Surface made of compressed gases
Atmosphere: Variable in temperature, pressure and composition
Age: 2-10 billion years
Equator diameter: 140,000 to 10,000,000 km
Life: none known yet
Surface: Surface made of compressed gases
Atmosphere: Variable in temperature, pressure and composition
Age: 2-10 billion years
Equator diameter: 140,000 to 10,000,000 km
Life: none known yet
Also known as the planets of Uranus, these giants have completely different compositions from other giant worlds, the core is mostly rocky and icy, surrounded by a fine layer of methane, water and ammonia. In addition, the magnetic field is inclined to the axis of rotation. Class I planets usually form at the edge of the star system.