When an emission line of helium from a galaxy is shifted toward the red, it means that the galaxy is moving away from the viewer. This phenomenon is known as redshift and occurs due to the Doppler effect, where the wavelength of light is stretched as the source moves away.
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 contains a small percent of hydrogen.
The galaxy contains a small 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.
1 answer