Question

Use the scenario to answer the question.
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.
In one or two sentences, make a hypothesis about the movement of the galaxy and explain at least one way to test the hypothesis.

Answer 1

Hypothesis: The newly discovered galaxy is moving away from the Milky Way galaxy, indicating it is part of the expanding universe. To test this hypothesis, the astronomer can measure the redshift of light from the galaxy, which indicates its velocity relative to the Milky Way; a significant redshift would support the idea of it moving away from us.