Question

According to the spectrum shift in this image, the star we are looking at is __________________________ and moving ______________________ us.

options:

blue-shifting ; closer to


blue-shifting ; further from


red-shifting ; closer to


red-shifting ; further from

Answer 1

Answer: D

Step-by-step explanation:

The lab frame is the same as the rest frame. In the lab, we see the first spectrum. But when we look at the star, we record the second spectrum. When stars move away from us, the light that they emit is red shifted. You can see this by comparing the lines, which are shifting towards the red part of the spectrum.