Is Space Expanding Within Clusters of Galaxies

question 51

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

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