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Ch 9 Earth and Space By R. Aldridge
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sun the star at the center of our solar system
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rotate To spin on an axis
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axis an imaginary line that passes through Earths center and its North and South Poles
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revolve To travel in a closed path
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orbit the path one body takes in space as it revolves around another body
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equator an imaginary line around Earth, equally distant from the North and South Poles
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moon any natural body that revolves around a planet
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crater a bowl- shaped, low area on the surface of a planet or moon
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moon phase one of the shapes the moon seems to have as it orbits Earth
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eclipse an event occurs when one object in space passes through the shadow of another object in space
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refraction the bending of light as it moves from one material to another
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star a huge ball of very hot gases in space
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solar system A star and all the planets and other objects that revolve around it
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constellation a pattern of stars, named after a mythological or religious figure, an object, or an animal
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planet a body that revolves around a star
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universe everything that exists, including such things as stars, planets, gas, dust, and energy
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galaxy a grouping of gas, dust, and many stars, plus any objects that orbit those stars
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