The expansion of the universe is due to the
A) motion of galaxies through space
B) expansion of space within galaxies
C) expansion of stars within galaxies
D) expansion of space between galaxies

Question

Quizplus · Accepted Answer

The expansion of the universe is due to the expansion of space between galaxies. This is supported by observations such as the redshift of light from distant galaxies, which indicates that they are moving away from us and from each other. This expansion is not due to the motion of galaxies through space or the expansion of stars within galaxies.

The Expansion of the Universe Is Due to the