Imagine that an astronomer in an alternate universe observes all galaxies to be blueshifted relative to the Milky Way.Which of the following would this imply?
A) The Big Bang happened in the recent past.
B) Space is contracting.
C) The Milky Way is the center of the universe.
D) Galaxies do not rotate

Question

Quizplus · Accepted Answer

In our universe, galaxies are observed to be redshifted, which indicates that the universe is expanding. If all galaxies were blueshifted in an alternate universe, it would suggest that space itself is contracting, bringing all the galaxies closer together.

Imagine That an Astronomer in an Alternate Universe Observes All