If the early universe had been perfectly uniform, galaxies could not have formed. As it is, cosmologists believe the variations observed in the cosmic microwave background which were sufficient to produce the galaxies and other structures now seen were only about 3 parts in
A) 10.
B) 1000.
C) 100,000.
D) 10 million.

Question

Quizplus · Accepted Answer

The variations in the cosmic microwave background that led to the formation of galaxies and other structures were about 3 parts in 100,000. This small level of non-uniformity was crucial for the gravitational collapse that eventually formed galaxies.

If the Early Universe Had Been Perfectly Uniform, Galaxies Could