Suppose that we look at a photograph of many galaxies.Assuming that all galaxies formed at about the same time,which galaxy in the picture is the youngest?
A)the one that is reddest in color
B)the one that is bluest in color
C)the one that is farthest away
D)the one that is closest to us
E)the one that appears smallest in size

Question

Quizplus · Accepted Answer

The galaxy that is farthest away is the youngest because the light from it has taken the longest time to reach us, meaning we are seeing it as it was in the more distant past.

Suppose That We Look at a Photograph of Many Galaxies