planet - National Geographic Society
https://www.nationalgeographic.org/encyclopedia/planet/
WebOct 19, 2023 · A planet is a large object that orbits a star. To be a planet, an object must be massive enough for gravity to have squeezed it into a spherical, or round, shape,. It must also be large enough for gravity to have swept up any rocky or icy objects from its path, or orbit, around the star.
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