By measuring the star formation rate in galaxies as a function of their redshift, we have learned that the average star formation rate in galaxies peaked approximately ________ years ago.
A) 1 billion
B) 3 billion
C) 5 billion
D) 7 billion
E) 11 billion

Question

Quizplus · Accepted Answer

The average star formation rate in galaxies peaked around 11 billion years ago, which corresponds to a redshift of about 2-3. This period is often referred to as the "cosmic noon" when the universe was most active in forming stars.

By Measuring the Star Formation Rate in Galaxies as a Function