When an emission line of helium from a galaxy is shifted toward red, it means that the galaxy is moving away from the viewer. This phenomenon is known as redshift, which occurs due to the Doppler effect as objects in space move away from us, causing their light to stretch to longer wavelengths.
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