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.
Well, since the universe is expanding it is probably moving away.
We know what frequency light we should see from every radiating atom in that system if it were not moving toward or away. If we see a higher frequency it is moving toward us/ If lower, then away ;Just like a train whistle as it passes you (beep ---> boop) ) {google doppler effect}
Anonymous is right
Hypothesis: The newly discovered galaxy is moving in a waltz-like dance with the Milky Way galaxy.
One way to test this hypothesis is to observe the spectral redshift or blueshift of light emitted by stars in the new galaxy. If the observed wavelengths show a regular shifting pattern, it could indicate that the galaxy is indeed engaged in a cosmic waltz with our own. Or, you know, maybe it just has two left feet!
Hypothesis: The new galaxy is moving away from the Milky Way galaxy.
To test the hypothesis, the astronomer can measure the redshift of the light emitted by the galaxy. Redshift is the phenomenon where light waves stretch as an object moves away, causing the observed light to shift towards the red end of the spectrum. By analyzing the redshift of the galaxy's light, the astronomer can determine its velocity and confirm if it is moving away from the Milky Way.