Planet

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The gods of Olympus, after whom the Solar System's planets are named

A planet () is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.

• See also: Wikipedia, Wiktionary, Commons

• Related: Extraterrestrial skies, Landings on other planets, Space exploration, Planetary habitability, Planetary science, Exoplanetology, Theoretical planetology, Planets in astrology, Planets in science fiction

International Astronomical Union website International Astronomical Union website www.iau.org - Web

Photojournal NASA Photojournal NASA photojournal.jpl.nasa.gov - Web

NASA Planet Quest – Exoplanet Exploration NASA Planet Quest – Exoplanet Exploration planetquest.jpl.nasa.gov - Web

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Illustration comparing the sizes of the planets wi... Illustration comparing the sizes of the planets with each other, the Sun, and other stars www.co-intelligence.org/newsletter/comparisons.html - Web

"Regarding the criteria for planethood and propose... "Regarding the criteria for planethood and proposed planetary classification schemes." www.boulder.swri.edu/~hal/planet_def.html - Web

Planetary Science Research Discoveries Planetary Science Research Discoveries www.psrd.hawaii.edu - Web

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