Is Space Expanding Within Clusters of Galaxies

question 77

Multiple Choice

Is space expanding within clusters of galaxies?

• A)No,because the universe is not old enough yet for these objects to have begun their expansion.
• B)No,because expansion of the universe affects only empty space,not space in which matter is present.
• C)Yes,and that is why clusters tend to grow in size with time.
• D)No,because their gravity is strong enough to hold them together even while the universe as a whole expands.

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