Class C
Surface
Iron, Silicate
Atmosphere
simple, impenetrable
Temperature
40 to 55 °C
Class F
Surface
Silicate, Metals
Atmosphere
high oxygen content
Temperature
-10 to 10 °C
Class G
Surface
Desert planet
Atmosphere
oxygenic
Temperature
51 to 65 °C
Class I
Surface
Silicate, Metals, liquid
Atmosphere
noble gases
Temperature
35 to 60 °C
Class J
Surface
Silicate
Atmosphere
sparse, noble gases
Temperature
-35 to -25 °C
Class K
Surface
Silicate, little to no water
Atmosphere
sparse
Temperature
-15 to 0 °C
Class L
Surface
Silicate, partially covered in water
Atmosphere
Nitrogen, Oxygen, Argon
Temperature
15 to 40 °C
Class M
Surface
Silicate, partially covered in water
Atmosphere
Nitrogen, Oxygen
Temperature
5 to 25 °C
Class N
Surface
Silicate, completely covered in water
Atmosphere
Nitrogen, Oxygen
Temperature
-5 to 15 °C