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  1. Dictionary
    planet
    /ˈplanɪt/

    noun

    • 1. a celestial body moving in an elliptical orbit round a star.

    More definitions, origin and scrabble points

  2. A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighborhood around its orbit.

  3. Jun 27, 2019 · A planet must do three things: it must orbit a star, it must be big enough to have enough gravity to force a spherical shape, and it must be big enough that its gravity cleared away any objects of a similar size near its orbit.

  4. en.wikipedia.org › wiki › PlanetPlanet - Wikipedia

    A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. [1] .

  5. Oct 18, 2023 · What is a planet? Mars, the fourth planet from the sun. Credit: NASA / JPL. According to a definition issued by the International Astronomical Union (IAU) in 2006, a planet is a celestial...

  6. A planet is a celestial body that is in orbit around a star; it has enough mass for its gravity to create a round shape; and it has cleared its neighborhood of smaller objects. Once planets form in disks, they are not going to stay in place.

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