The expansion of the universe takes place
A) only over distances about the size of a galaxy or larger; consequently, the Milky Way Galaxy expands, but the solar system does not.
B) only between objects separated by a vacuum; as a result, the bodies do not expand, but the Earth-Moon system does.
C) between all objects, even between the atoms in the bodies, although the expansion of a person is too small to be measured reliably.
D) primarily in the huge voids between clusters of galaxies. "Small" objects like galaxies or Earth do not expand.

Question

Quizplus · Accepted Answer

The expansion of the universe primarily occurs in the vast voids between galaxy clusters. Gravitationally bound systems like galaxies, solar systems, and smaller objects do not expand.

The Expansion of the Universe Takes Place