Which of the following statements best summarizes what studies of the masses of
ID: 284175 • Letter: W
Question
Which of the following statements best summarizes what studies of the masses of individual galaxies and of clusters of galaxies have told us about dark matter?
A) Dark matter is present between galaxies in clusters, but not within individual galaxies.
B) Dark matter is the dominant form of mass in both clusters and individual galaxies.
C) Within individual galaxies, dark matter is always concentrated near galactic center, and within clusters it is always concentrated near the cluster center.
D) Dark matter is present in individual galaxies, but there is no evidence that it can exist between the galaxies in a cluster.
Explanation / Answer
Answer: B) Dark matter is the dominant form of mass in both clusters and individual galaxies.
Dark matter is the dominant form of mass in both clusters and individual galaxies statements best summarizes what studies of the masses of individual galaxies and of clusters of galaxies have told us about dark matter.
Dark matter is invisible and this dark matter makes up most of the universe.
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