Aquaria

==Description==
Aquaria (Ice planet, water planet) is a type of planet than contains water in the form of exotic ices and liquid (but not vapor or supercritical fluid - that is a minineptune). The boundary is > 25% by mass of the planet. Almost all dwarf planets and moons of gas planets in the Solar System are aquaria. Aquaria is the most common planet type in the Space Engine universe.
==General characteristics==
Aquaria is a very common type of planet (and moon). Most commonly found ocean planets and as icy planets consisting of a global cryosphere. The gravity of such planets is low, as a result of its small mass. An ice planet's surface can be composed of water, methane, ammonia, carbon dioxide (known as "dry ice"), carbon monoxide, nitrogen, and other volatiles, depending on its surface temperature. Ice planets would have surface temperatures below 260 K (−13 °C) if composed primarily of water, below 180 K (−93 °C) if primarily composed of CO2 and ammonia, and below 80 K (−193 °C) if composed primarily of methane. Many ice worlds likely have subsurface oceans, warmed by internal heat or tidal forces from another nearby body. Ocean planets (Superoceanic aquaria) usually have an ocean +100 km deep. Ice VI and ice VII are most often found at the bottom. Typically, these oceanic planets have a dense atmosphere and clouds.
==Life==
Liquid subsurface water would provide habitable conditions for life, including fish, plankton, and microorganisms. Subsurface plants as we know them could not exist because there is no sunlight for the use of photosynthesis. Microorganisms can produce nutrients using specific chemicals (chemosynthesis) that may provide food and energy for other organisms. Exotic subglacial life can also appear in non-water subglacial oceans. In the Space Engine universe, there are a huge number of aquaria that have subglacial life. Probably subglacial life is the most common type of life in the Space Engine. Some planets, if conditions are right, may have significant atmospheres and surface liquids like Saturn's moon Titan, which could be habitable for exotic forms of life. In most cases, it is on the aquarias that exotic life appears, due to the fact that exotic liquids, such as N2, are often found on icy planets. Ocean planets also sometimes have an marine biosphere. Sometimes aquaria can have entire seas of H2O (or SO2), on which an entire biosphere is formed from organic multicellular terrestrial and marine life. The color of the flora on such planets is always blue and light blue, similar to the marine terra, with life that revolve around F-class star.
#https://en.wikipedia.org/wiki/Ocean_world
#https://en.wikipedia.org/wiki/Ice_planet
Category:Planet Types
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