Which of the following provides evidence for the existence of dark matter?
A) The orbital speeds of stars in galaxies are higher than what can be accounted for by the detectable mass in the galaxy.
B) The orbital speeds of galaxies in clusters are higher than what can be accounted for by the detectable mass of the cluster.
C) the ability of rich galaxy clusters to prevent their hot gases from expanding
D) All of these choices are correct.
Correct Answer:
Verified
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A)
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A)
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