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Appendix 4: Planet Classifications


Class name   Description Real examples
Selena Rocky world with no significant atmosphere   Mercury
Moon
Io
Desert Rocky world with an atmosphere and a
surface shaped by atmospheric processes
 
Venus
Mars
Terra Rocky world with an atmosphere and
liquid water on its surface
 
Earth
Oceania World with upper layers of liquid or
gaseous water and no solid surface
 
No examples in the Solar system;
GJ 1214 b is an extrasolar oceania candidate 
Ice world World with a surface composed of solid ices Europa
Triton
Pluto
Titan Ice world with liquid hydrocarbons on its
surface
 
Titan
Ice giant Massive planet composed primarily of ices,
such as water, methane, nitrogen, carbon
dioxide, ammonia, etc.
Uranus
Neptune
Gas giant Massive planet composed primarily of
hydrogen and helium
 
Jupiter
Saturn
Asteroid A small, irregularly shaped world Phobos
1P/Halley
Vesta

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