What is planet?

  • (noun): Any of the celestial bodies (other than comets or satellites) that revolve around the sun in the solar system.
    See also — Additional definitions below

Planet

A planet (from Ancient Greek αστήρ πλανήτης (astēr planētēs), meaning "wandering star") 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. The term planet is ancient, with ties to history, science, mythology, and religion. The planets were originally seen by many early cultures as divine, or as emissaries of deities. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. In 2006, the International Astronomical Union (IAU) officially adopted a resolution defining planets within the Solar System. This definition has been both praised and criticized, and remains disputed by some scientists since it excludes many objects of planetary mass based on where or what they orbit. While eight of the planetary bodies discovered before 1950 remain "planets" under modern definition, some celestial bodies, such as Ceres, Pallas, Juno, Vesta (each an object in the Solar asteroid belt) and Pluto (the first-discovered trans-Neptunian object), that were once considered planets by the scientific community are no longer viewed as such.

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Some articles on planet:

Koprulu Sector - Bhekar Ro
... Bhekar Ro is a fringe planet in Terran space with unpredictable weather ... by a group of refugees fleeing from the Terran Confederacy, settling on the planet in hope of living independently and self-sustaining ... The only settlement on the planet is Free Haven, built by the first colonists who came to Bhekar Ro to escape from the Terran Confederacy ...
Koprulu Sector - Aiur
... lush jungle world, the Protoss are the only intelligent life to have evolved on the planet, though the process was enhanced and sped up by the Xel'Naga ... The planet suffered tremendous damage, though with the conflict's resolution the Protoss were able to rebuild and use the planet to expand outwards, colonizing other worlds ... Troops were trained and ships built on Aiur and sent to fight on distant planets by traveling through Warp portal buildings constructed on the battlefield ...
Planet - Related Terms
... Comet Double planet Dwarf planet Extrasolar planet (or Exoplanet) – celestial body outside the Solar System Mesoplanet Minor planet – celestial body smaller than a planet ...
Koprulu Sector - Brontes
... with a small orbital platform for space traffic in orbit of the planet ... Unlike most planets in Terran space, Brontes IV has a more diverse environment, ranging from the typical wastelands of Terran colonies through highly volcanic areas to large jungles ... Several areas of the planet have large valleys rich in mineral deposits ...
Outer Planets
... The outer planets are those planets in the Solar System beyond the asteroid belt, and hence refers to the gas giants, which are in order of their distance from the Sun Jupiter is the ... Saturn is the second largest planet, with a large and bright ring system ... The outer planets all have ring systems, although all but Saturn's are faint ...

More definitions of "planet":

  • (noun): A person who follows or serves another.
    Synonyms: satellite

Famous quotes containing the word planet:

    Until they saw, over the mists
    of Venus, two fish creatures stop
    on spangled legs and crawl
    from the belly of the sea.
    And from the planet park
    they heard the new fruit drop.
    Anne Sexton (1928–1974)