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- Dictionaryplanet/ˈplanɪt/
noun
- 1. a celestial body moving in an elliptical orbit round a star.
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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.
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.
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] .
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...
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.