an astronomer discovers a new galaxy using a telescope. the astronomer wants to investigate how the galaxy is moving relative to the milk 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
Hypothesis: The new galaxy is moving towards or away from the Milky Way galaxy due to gravitational forces between them.
Testing the hypothesis: The astronomer can use the Doppler effect to measure the galaxy's redshift or blueshift, which would indicate whether it is moving away (redshift) or towards (blueshift) the Milky Way galaxy.