The best explanation for the activity at the center of the galaxy is a(n) ____.
A) supercluster of O and B stars
B) black hole with a mass several thousand times the Sun's
C) giant atomic hydrogen cloud energized into a single, massive emission nebula
D) black hole with a mass several million times the Sun's
E) exotic object known as a "magnetar"
Correct Answer:
Verified
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
Q53: _ variable stars are useful in measuring
Q54: One of the most important features that
Q56: O and B stars only occur in
Q57: Why do astronomers conclude that the spiral
Q58: At the center of our galaxy, _.
A)
Q59: What is the correct ordering of galactic
Q60: Objects used to map spiral arms are
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