The observations that show that the expansion of the universe is speeding up tell us the universe must contain
A) gravity.
B) dark matter.
C) an effect opposing gravity.
D) black holes.
E) cosmic microwave background radiation.

Question

Quizplus · Accepted Answer

The acceleration of the universe's expansion suggests the presence of dark energy, an effect that opposes gravity.

The Observations That Show That the Expansion of the Universe