Why do astronomers conclude that the spiral arms are places of active star formation?
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Q52: A "galactic fountain" is _.
A) a stream
Q53: _ variable stars are useful in measuring
Q54: One of the most important features that
Q55: The best explanation for the activity at
Q56: O and B stars only occur in
Q58: At the center of our galaxy, _.
A)
Q59: What is the correct ordering of galactic
Q60: Objects used to map spiral arms are
Q61: Astronomers refer to elements heavier than helium
Q62: What parts of the galaxy are considered
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