_______________ variable stars are useful in measuring the distance to globular clusters.
Correct Answer:
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Q48: How have astronomers determined the mass of
Q49: What observed feature of the Milky Way
Q50: Which statement about stellar populations is correct?
A)
Q51: Elements above hydrogen and helium come from
Q52: A "galactic fountain" is _.
A) a stream
Q54: One of the most important features that
Q55: The best explanation for the activity at
Q56: O and B stars only occur in
Q57: Why do astronomers conclude that the spiral
Q58: At the center of our galaxy, _.
A)
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