The first nuclei were formed about three minutes after the Big Bang, through the process called Big Bang nucleosynthesis, which formed the hydrogen and helium that became the content of the first stars, and is responsible for the present hydrogen/helium ratio of the cosmos.
The first nuclei were formed about three minutes after the Big Bang. This was through the process. This process was called Big Bang nucleosynthesis. Big Bang nucleosynthesis formed the hydrogen. Big Bang nucleosynthesis formed helium. These hydrogen became the content of the first stars. Helium became the content of the first stars. These hydrogen is responsible for the present hydrogen/helium ratio of the cosmos. Helium is responsible for the present hydrogen/helium ratio of the cosmos.