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 a 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 newly discovered galaxy is either moving toward the Milky Way Galaxy or moving away from it.
To test the hypothesis, the astronomer can measure the redshift or blueshift of the galaxy's spectral lines using spectroscopy, as a higher redshift would indicate the galaxy is moving away, while a higher blueshift would suggest it is moving toward the Milky Way.