If observations had shown that the cosmic microwave background was perfectly smooth (rather than having very slight variations in temperature),then we would have no way to account for
A)the relationship between the strong and the weak force.
B)the fact that our universe is expanding.
C)how galaxies came to exist.
D)the existence of helium in the universe.

Question

Quizplus · Accepted Answer

The slight variations in the cosmic microwave background radiation are believed to have led to the formation of galaxies as well as other large-scale structures in the universe through gravitational collapse. If the cosmic microwave background had been perfectly smooth, there would be no way to explain how galaxies (and therefore, large-scale structure) came to exist.

If Observations Had Shown That the Cosmic Microwave Background Was