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Planète CI
A planet, in astronomy, is one of a class of celestial bodies that orbit stars. (A dwarf planet is a similar, but officially mutually exclusive, class of body.) * For articles on specific types of planet, see List of planets Planet or Planets may also refer to: * Planets in astrology, celestial bodies used in prophecy * The planet, a term often used to refer to Earth As an acronym * Professional Landcare Network, a US organization for lawn care, landscape architecture and related professionals * Probing Lensing Anomalies Network, a network of optical astronomical telescopes used for photometry * Postal Alpha Numeric Encoding Technique, a barcoding system for sorting mail used by the US Postal Service Computing * Planet (software), software for collecting posts from RSS feeds and republishing them on a website * Planet Network, network of video game-related websites operated by GameSpy * Planet Online, UK Internet service provider * The Planet Internet Services, large dedicated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planet
A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk. Planets grow in this disk by the gradual accumulation of material driven by gravity, a process called accretion. The Solar System has at least eight planets: the terrestrial planets Mercury, Venus, Earth and Mars, and the giant planets Jupiter, Saturn, Uranus and Neptune. These planets each rotate around an axis tilted with respect to its orbital pole. All of them possess an atmosphere, although that of Mercury is tenuous, and some share such features as ice caps, seasons, volcanism, hurricanes, tectonics, and even hydrology. Apart from Venus and Mars, the Solar System planets generate magnetic fields, and all except Venus and Mercury have natural satellites. The giant planets bear plan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
