In the universe,we can consider four different regimes of space in which distances between objects might be changing as a result of the general expansion of the universe: (1)distances between different parts of Earth; (2)distance between planets in the solar system; (3)distances between stars in the Milky Way; (4)distances between clusters of galaxies.In which of these regimes are the distances changing because of this expansion?

Question

Quizplus · Accepted Answer

Only regime 4, distances between clusters of galaxies, are changing due to the expansion of the universe. The other regimes are governed by other physical processes, such as gravity, that affect their distances but are not primarily due to the expansion of the universe.

In the Universe,we Can Consider Four Different Regimes of Space