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Explain why the Moon rotates in the same amount of time as it takes to orbit once around the Earth.
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Q23: You observe the spectrum of two stars.
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Q27: How was retrograde motion explained in the
Q38: List, in order, Kübler-Ross's five stages of
Q51: Venus and Earth probably formed with similar
Q73: In the heliocentric system, retrograde motion is
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Q93: Mars has many large shield volcanoes because