Hypothesis: The newly discovered galaxy is moving away from the Milky Way galaxy, contributing to the observed expansion of the universe. To test this hypothesis, the astronomer can measure the galaxy's redshift using spectroscopy, which will determine the shift in light wavelengths due to the galaxy's motion, thereby indicating whether it is receding from or approaching the Milky Way.
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 sentences, make a hypothesis about the movement of the galaxy and explain at least one way to test the hypothesis.
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