Test Article

An ocean world, ocean planet, water world, or water planet is a type of planet or natural satellite that contains a substantial amount of water in the form of oceans, as part of its hydrosphere, either beneath the surface, as subsurface oceans, or on the surface, potentially submerging all dry land^[4] The term ocean world is also used sometimes for astronomical bodies with an ocean composed of a different fluid or thalassogen,^[5] such as lava (the case of Io), ammonia (in a eutectic mixture with water, as is likely the case of Titan's inner ocean) or hydrocarbons (like on Titan's surface, which could be the most abundant kind of exosea).^[6] The study of extraterrestrial oceans is referred to as planetary oceanography.