When an emission line of helium from a galaxy is shifted toward the red, it means the galaxy is moving away from the viewer. This phenomenon is known as redshift, and it occurs because the wavelengths of light emitted by the galaxy are stretched as it moves away, resulting in a shift toward the red end of the spectrum.
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 is moving toward the viewer.
The galaxy is moving toward the viewer.
The galaxy contains a small percent of hydrogen.
The galaxy contains a small percent of hydrogen.
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1 answer