In the 1990s, astronomers studying distant Type Ia supernovae discovered that the
A) universe's expansion rate has been decreasing with time.
B) universe is finite in size.
C) universe's expansion rate has been increasing with time.
D) rate of supernova explosions has been increasing with time.
E) universe's expansion rate has stayed constant with time.

Question

Quizplus · Accepted Answer

In the 1990s, astronomers discovered that the universe's expansion rate has been increasing over time, leading to the concept of dark energy.

In the 1990s, Astronomers Studying Distant Type Ia Supernovae Discovered