SAT #14 Reading (Question 51)

Question

According to the figure, which choice is a possible redshift of a galaxy made of stars that formed during the cosmic dawn?

Answer 1

Answer Choice D is the correct answer because the top of the Figure gives the redshift measurement, and the gray shaded area represents star formation rates during the cosmic dawn. Since the graph only shows redshifts between 6-9 for star-formation rates during the cosmic dawn, we can only choose Answer Choice D which says 9.0. Answer Choices A, B and C are incorrect because they all give redshifts below 6.0.

How to solve this? The Question asks, “According to the figure, which choice is a possible redshift of a galaxy made of stars that formed during the cosmic dawn?” [...].