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What allowed Henrietta Levitt to conclude that the pulsation period of Cepheid variables was related to their intrinsic brightness?
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Q14: The Hγ line has a wavelength of
Q53: What is indicated by the fact that
Q60: After the first solid grains formed in
Q64: For an observer on Uranus, the plane
Q71: The graph plots the escape velocity of
Q72: What is the source of the pink
Q93: Why were quasars so mysterious when first
Q98: What is the evidence that Mercury has