In the 1990s, astronomers found that distant Type I supernova were __________ than they expected, leading them to conclude that __________.
A) brighter; the universe's expansion rate was decreasing with time
B) brighter; the universe was finite in size
C) fainter; the universe's expansion rate has been increasing with time
D) fainter; the universe was infinite in size
E) fainter; the universe was finite in size

Question

Quizplus · Accepted Answer

The observation that distant Type I supernovae were fainter than expected led astronomers to conclude that the universe's expansion rate has been increasing with time, a phenomenon referred to as cosmic acceleration. This discovery was awarded the Nobel Prize in Physics in 2011.

In the 1990s, Astronomers Found That Distant Type I Supernova