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center,earth, solar system, longitude, latitude
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center, sun, planets, revolve, solar system
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astronomer, accurate observation, studied solar system
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an optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.
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planets around sun, law planetary motion
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planets moons, tower drop, mass ,prison
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universal gravitational pull, three motion laws
