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The top documents tagged [objects planets]
Early Western people believed that the Earth was the center of the universe. That is called a geocentric system. Ptolemy, a Greek astronomer believed that
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Static Electricity. Layout of an Atom An atom has a center, called the nucleus, which is made of protons and neutrons Protons are positive Neutrons are
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Astronomy Chapter Seventeen: The Solar System 17.1 About the Solar System 17.2 The Planets 17.3 Other Solar System Objects
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