When we look at galaxies in the universe and measure their star formation rates,we find that galaxies at redshifts z ≈1 have higher star formation rates than they do now.At that time,the universe was __________ times the size it is today.
A)0.1
B)0.2
C)0.5
D)0.7
E)0.90

Question

Quizplus · Accepted Answer

The size of the universe at redshift z ≈1 was approximately half of what it is today. This is due to the fact that the universe has been expanding since the Big Bang, so at earlier times it was smaller.

When We Look at Galaxies in the Universe and Measure