"revolution", "the orbit of an object around another object" "rotation", "spin of an object around its axis" "planet", "an object that orbits the sun, nearly spherical in shape, and has no other large objects in its orbital path" "dwarf planet", "nearly spherical object that share their orbits around the Sun with similar sized objects" "asteroids", "small, rock objects that orbit the Sun between Jupiter and Mars" "meteoroid", "small, rocky particle that moves through space (size of a fingernail)" "meteor", "a meteroid that has entered Earth's atmosphere and produces a streak of light" "meteorite", "a meteor that reaches the surface of Earth" "comet", "small, icy object that orbits the sun and develops a tail as it nears the Sun" "moon", "natural satellite that orbits an object other than a star" "astronomical unit (AU)", "the distance from the Sun to the Earth"
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