* Extreme Temperatures and Energies: The early universe was incredibly hot and dense. The temperatures were so high that even quarks (the fundamental particles that make up protons and neutrons) couldn't bind together.
* Quark-Gluon Plasma: The universe was filled with a soup of fundamental particles, including quarks and gluons (the particles that mediate the strong force). This is called a quark-gluon plasma.
* Cooling and Binding: As the universe expanded and cooled, the energy levels dropped. This allowed quarks to bind together, forming protons and neutrons within the first few minutes after the Big Bang.
Timeline:
* First second: The universe was filled with quark-gluon plasma.
* First few minutes: Protons and neutrons formed as the universe cooled.
* First few hundred thousand years: The universe continued to cool, allowing hydrogen and helium atoms to form.
Therefore, protons and neutrons weren't present at the very instant of the Big Bang, but formed shortly after as the universe cooled and energy levels decreased.
