During the formation of the universe, where did the density enhancements come from that subsequently collapsed to form superclusters of galaxies?
A) turbulence during the time when the universe was opaque, which left denser regions that were free to collapse when the universe became transparent
B) quantum fluctuations in the density of matter during the early Big Bang, which were later expanded by inflation
C) spatial variations in the rate heating from pair annihilation after the first second of the Big Bang
D) random gravitational fragmentation of the matter in the universe after the era of recombination

Question

Quizplus · Accepted Answer

Quantum fluctuations in the density of matter during the early Big Bang, which were later expanded by inflation, are believed to be the origin of the density enhancements that led to the formation of superclusters of galaxies. These tiny fluctuations were magnified on a cosmic scale by the rapid expansion of the universe during its inflationary phase.

During the Formation of the Universe, Where Did the Density