Galaxy - A system of billions of stars, nebulae and other objects held together by gravity., Nebula - A collection of dust and gas where new stars are born, Planet - A spherical rocky object that orbits a star, Star - A sphere of matter with a temperature and density great enough to cause a nuclear reaction, Solar System - A star and all the planets, asteriods, comets, and other objects held together by gravity, Moon - A is a natural object that orbits a planet, Universe - Everything that exists,

Components of the Universe Definitions

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