In our 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)distances between planets in our solar system,(3)distances between stars in the Milky Way Galaxy,and (4)distances between clusters of galaxies.In which of these regimes are the distances changing because of the universal expansion?

Question

Quizplus · Accepted Answer

The expansion of the universe affects distances on the largest scales, such as between clusters of galaxies. On smaller scales, like within galaxies or solar systems, gravitational forces are strong enough to hold objects together, preventing them from expanding with the universe.

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