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Like Earth, the Moon has a day side and a night side, which change as the Moon rotates.
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Between four and seven times a year, Earth, Moon and Sun line up just right to create the cosmic-scale shadow show known as an eclipse.
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Composite of lunar eclipse phases over night sky
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Several theories vie for dominance but most agree on one thing — Earth's Moon was born from destruction.
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Artist depiction of two planets colliding.
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