What was the significance of the end of the era of nucleosynthesis,when the universe was about 5 minutes old?
A)The proportions of dark matter and luminous matter had been determined.
B)The basic chemical composition of the universe had been determined.
C)It marks the time at which the first stars formed.
D)It marks the time at which the expansion of the universe had settled down to its current rate.

Question

Quizplus · Accepted Answer

The end of the era of nucleosynthesis marked the time when the basic chemical composition of the universe had been determined. During this era, light elements such as hydrogen and helium were formed through nuclear fusion, which set the stage for the formation of heavier elements later on. The exact abundances of these elements are determined by the physical conditions during this era, and they are consistent with observations of the universe today.

What Was the Significance of the End of the Era