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Question
What does it mean when an emission line of helium from a galaxy is shifted toward red?(1 point)
Responses
The galaxy contains a large percent of hydrogen.
The galaxy contains a large percent of hydrogen.
The galaxy is moving away from the viewer.
The galaxy is moving away from the viewer.
The galaxy contains a small percent of hydrogen.
The galaxy contains a small percent of hydrogen.
The galaxy is moving toward the viewer.
1 answer
The correct response is:
The galaxy is moving away from the viewer.
A redshift indicates that the light from the galaxy is being stretched, which typically means that the galaxy is moving away from us. This is consistent with Hubble's law and the expansion of the universe.
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1 answer