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stars are huge balls of hot, glowing gases that produce their own heat and light
astronomy is the study of objects in space and their characteristics
galaxy is a group of billions of stars, the objects that orbit the stars, gas, and dust
universe is everything that exists
solar system is made up of a star and planets and other space objects that revolve around it
planet is a large round body that revolves around a star
dwarf planet are nearly round bodies whose orbits cross the orbits of other bodies
asteroids are rock and iron objects that orbit the sun
comet is a chunk of frozen gases, rock, ice, and dust
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