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The Solar System: Chapter 2

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Across
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A natural or human-built object that revolves around another object in space. The moon is a natural ___________ of Earth.
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A representatiion of the universe in which stars and planets revolve around Earth. Ptolemy proposed a _____________ __________ of the universe.
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An object in space that resembles Earth in size, density and in its mainly composition, such as Mars.
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Consists of a star and the objects that revolve around it.
Down
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A large planet that is made up of mostly gaseous and liquid substances.
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A hypothesis that describes how the universe began with a huge explosion and says that everything in the universe was once concentrated at one tiny point.
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A representation of the relationship between the Sun and planets in which the planets revolve around the Sun. (Copernicus)
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A natural object that revolves around a planet.