theory of primordial nucleosynthesis

Primordial nucleosynthesis refers to the process that occurred shortly after the Big Bang, when the universe was hot and dense. During this time, protons and neutrons combined to form light elements, primarily hydrogen, helium, and small amounts of lithium and beryllium. These reactions happened within the first few minutes of the universe's existence, shaping the composition of matter we observe today. This theory helps explain why about 75% of ordinary matter consists of hydrogen and about 25% of helium, setting the stage for the formation of stars and galaxies.