Multiple Choice
Which single major problem perhaps puzzles astronomers the MOST as they attempt to interpret the properties and behavior of clusters of galaxies?
A) the rate of supernova occurrence in galaxies in some clusters
B) the missing-mass problem, where the amount of mass needed for galactic cluster stability is estimated to be at least 10 times more than the observed visible mass
C) the presence of star formation in many galaxies long after it is expected to have died out
D) the structure and motion of spiral arms in galaxies in many clusters
Correct Answer:
Verified
Correct Answer:
Verified
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