Planetary Types and Classifications

Class A:
Aquatic Planets most of, if not completely comprised of liquid. Generally artificially held together by some kind of probe, the water generally coming from the surface of a planet. These can be natural but only under the most extreme natural forces, these can often support very lush marine life and even sentient cultures. They work much like a gas giant. These are generally distant from stars and have no atmosphere above the surface of the water.

Class D:
Little to no atmosphere. Generally moons.
Uninhabitable

Class H:
Uninhabitable to most lifeforms, the atmosphere is argon and oxygen.
These planets are generally small rocky planets.

Class J:
Gas Giants, these are uninhabitable to most.

Class K:
Little or no water, minimal atmosphere, these planets are habitable, but not suitable for most. They are rocky planets.

Class L:
Generally Ice planets or colder climates, these planets can support most lifeforms provided that they have tolerances to cold. These planets support lush vegetation on the warmer variants.

Class M:
The most easily inhabited planets, they support most lifeforms and have large quantities of water.

Class N:
These planets have little or no oxygen, they are sulfuric planets.

Class T:
Gas Giants, Uninhabitable to most.

Class Y:
"Demon Planets" They are extremely hot planets with a harsh atmosphere, only certain species can live here.

Class P:
'Glaciated' Planets, they are cold and support hardy plant life.

Class F:
Geologically Inactive, these planets have no atmosphere either.