What is the primary form of evidence that has led astronomers to conclude that the expansion of the universe is accelerating?

Question

Quizplus · Accepted Answer

Observations of white dwarf supernovae have led astronomers to conclude that the expansion of the universe is accelerating. By measuring the brightness and redshift of these supernovae, astronomers can determine how fast they are receding from us and how much the expansion of the universe has affected their light. The observed brightness and redshift of these supernovae indicate that they are receding faster than expected if the expansion were slowing down, leading to the conclusion that the expansion is actually accelerating.

What Is the Primary Form of Evidence That Has Led