The modern theory of dark energy arises from observations showing that
A)galaxies spin at slower than expected rates.
B)superclusters are collapsing.
C)the speed of light is not exactly constant.
D)galaxies are accelerating away from each other.

Question

Quizplus · Accepted Answer

The observation that galaxies are accelerating away from each other led to the development of the modern theory of dark energy, which suggests that the universe is dominated by a mysterious form of energy that is causing this acceleration.

The Modern Theory of Dark Energy Arises from Observations Showing