Ocean planet
An Ocean planet is a hypothetical type of planet whose surface is completely covered with an ocean of water.
Planetary objects that form in the outer solar system begin as a comet-like mixture of roughly 50% water and 50% rock by weight. Simulations of solar system formation have shown that planets are likely to migrate inward or outward as they form, presenting the possibility that icy planets could wind up in orbits where their water becomes liquid, turning them into Ocean Planets. This possibility was first discussed in the professional astronomical literature by Marc Kuchner[1] and Alain Léger[2] in 2003.
The oceans on such planets could be hundreds of kilometers deep, much deeper than the oceans of Earth. The immense pressures in the lower regions of these oceans could lead to the formation of a mantle of exotic forms of ice. This ice would not necessarily be as cold as we understand ice. If the planet is close enough to its sun that the water's temperature reaches the boiling point, the water will become supercritical and lack a well-defined surface.[2]
Appearences in fiction
- The Star Trek:Voyager episode Thirty Days features an artificial ocean planet facing imminent destruction.
- The novel Noise by Hal Clement is centered on the ocean world Kainui, which, along with its twin uninhabited ocean planet, Kaihapa, circles a binary star system. Kainui's Maori-descended colonists live a nomadic existence, traveling about by boat or on one of the planet's anchorless floating cities.
- In Star Wars Episode II: Attack of the Clones, Obi-Wan Kenobi travels to Kamino, an ocean planet famous for its storms as well as its very advanced cloning technology.
References
- ^ "Volatile-rich Earth-Mass Planets in the Habitable Zone". Astrophysical Journal. 2003-10-10.
- ^ a b "Ocean Planets on the Brink of Detection". Physorg.com. 2007-02-02. Retrieved 2007-02-02.
- Léger, Alain (2004). "A new family of planets? 'Ocean Planets'". Icarus. 169: 499L. doi:10.1016/j.icarus.2004.01.001. arXiv:astro-ph/0308324.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - Selsis, F. (2007). "Could we identify hot Ocean-Planets with CoRoT, Kepler and Doppler velocimetry?". Icarus. 191: 453. doi:10.1016/j.icarus.2007.04.010. arXiv:astro-ph/0701608.
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