Nucleosynthesis: The Formation of Elements in the Universe
UP TALKS | Nucleosynthesis: Formation of the Elements
Lesson 1 Nucleosynthesis (Complete lesson)
Stellar Nucleosynthesis Explained in 4 Minutes
Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons, primarily protons and neutrons. The first nuclei were formed about three minutes after the Big Bang, through the process called Big Bang nucleosynthesis. Seventeen minutes later the universe had cooled to a point these processes ended, so only the fastest and simplest reactions occurred, leaving our universe containing about 75% hydrogen, 24% helium, and traces of other elements such as lithium and the hydrogen isotope deuterium. The universe still has approximately the same composition today.