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| [1.Our Solar System] | [3.Clusters, and Beyond...] | [5.The Expanding Universe] | [7.The Fate of Our Universe] | [9.Formation of a Galaxy] | [Return to Den Homepage] | |
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[2.Galaxies]
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[4.Gravity]
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[6.The Big Bang]
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[8.Weighing the Universe]
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[10.The Doppler Effect]
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