Universe - All mass, energy, space and time., Galaxy - Collection of stars, dust, remnants and gas held together by gravity., Solar System - Collection of celestial bodies orbiting a star., Star - A luminous sphere of gas that emits light and heat, held together by its own gravity., Planet - A celestial body that orbits a star and possesses sufficient mass to exist in a circular shape and has cleared its orbital neighborhood., Satellite - A celestial body that orbits a planet.,

Upper 2 Physics Space KA1

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