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Tycho Brahe's greatest contribution to astronomy was
Q8: The Kyoto Protocol represents the first significant
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Q18: Precession of the rotation axis of Earth
Q27: The sun has a continuous visual spectrum
Q32: Describe the evidence that best supports the
Q59: Reflecting telescope objectives here on Earth do
Q75: The lunar tides on Earth are making
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Q118: To determine the orbital period of a