Astronomers infer that the universe is expanding because distant galaxies all appear to .
A)be moving away from us, with more distant ones moving faster
B)rotate rapidly
C)be made mostly of dark matter
D)be growing in size

Question

Quizplus · Accepted Answer

The observation that distant galaxies appear to be moving away from us, with more distant ones moving faster, is consistent with the expanding universe model. This phenomenon is known as Hubble's law, named after astronomer Edwin Hubble, who first observed and quantified it. The expansion of the universe is thought to be driven by dark energy.

Astronomers Infer That the Universe Is Expanding Because Distant Galaxies