composition
temperature
temperature
timing of solar flares
timing of solar flares
Question 5
What does it mean when an emission line of helium from a galaxy is shifted toward red?(1 point)
Responses
The galaxy contains a small percent of hydrogen.
The galaxy contains a small percent of hydrogen.
The galaxy contains a large percent of hydrogen.
The galaxy contains a large percent of hydrogen.
The galaxy is moving toward the viewer.
The galaxy is moving toward the viewer.
The galaxy is moving away from the viewer.
The galaxy is moving away from the viewer.
1 answer
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 when the light from an object is stretched to longer wavelengths as the object moves away, indicating that the universe is expanding.
