The expansion of the universe means that:
A)as time goes by, galaxies move away from each other through empty space.
B)as time goes by, space itself expands carrying the galaxies along with it.
C)each object in the universe expands its size.
D)the light from distant galaxies is Doppler shifted as the galaxies move away from us.

Question

Quizplus · Accepted Answer

The expansion of the universe refers to the fact that space itself is expanding, which causes galaxies to move away from each other. This has been observed through the redshift of light from distant galaxies, indicating that they are moving away from us. The expansion of the universe does not affect the size of individual objects within it.

The Expansion of the Universe Means That