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Wrote a book about astronomy called ptolemaic theary.
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Brahe thought that the sun and the moon revolved around the earth.
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His theary was the sun was the center of the univers.
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Galileo was the first people to use a telescope.
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Showed that all objects in the universe attract each other through gravitational force.
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James proved that visible light is a part of the electromagnetic spectrum.
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Edwin Hubble proved that other galoxies existed beyond the edge of the milky Way.
