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) a force opposing gravity
D) black holes
E) cosmic microwave background radiation

Question

Quizplus · Accepted Answer

The observations that the expansion of the universe is speeding up indicates that there must be a force opposing gravity, known as dark energy. This is currently the leading hypothesis to explain the observed acceleration of the universe's expansion.

The Observations That Show That the Expansion of the Universe