Continuing the timeline

• 0.0001 seconds

  • The universe has cooled (photons have red-shifted) to 1 trillion K.
  • Photons no longer have enough energy to create protons and antiprotons.
  • Protons and antiprotons annihilate, leaving the extra 1 proton per billion.
  • Photons are still energetic enough to make electron-positron pairs
  • Too hot for nuclear fusion to occur. Photons destroy any nuclei that form.

Notes: