Ocean Planet near Thraikai

An Ocean Planet (aka water world) is a planet with a substantial amount of water on its surface or subsurface.[1][2] It can be completely or mostly covered in water. The liquid on the surface can consist of different fluids like lava or ammonia.

The surface can be a layer of ice with a liquid water ocean underneath. For example Ganymede has a liquid saltwater ocean below its icy surface.[3]

Probability of life on an ocean planet is high, because water is essential for most life forms (flora, fauna, sentient and non-sentient). Many species evolve in or around a source of water. These are rare and thus more valuable to discover.

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Some star systems have multiple ocean planets such as:

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