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Q1: How do astronomers explain the "superluminal" motions
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Q10: An observer at a latitude of 41
Q10: What happened to the gas that was
Q11: If you double the temperature of a
Q12: If the mass-losing star in a close
Q26: What causes Cepheid variables to vary in
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Q37: What is the altitude of the Sun
Q48: Suppose we observe a hot,tenuous gas with