An astronomer discovers a new galaxy using a telescope. The astronomer wants to investigate how the galaxy is moving relative to the Milky Way galaxy.

Question

In one sentence, make a hypothesis about the movement of the galaxy and explain at least one way to test the hypothesis.

(use a simple sentence)

Answer 1

The galaxy may be moving away from the Milky Way, and this can be tested by measuring the redshift of its light spectrum to determine its velocity.