Passage: From 10100 years (10 duotrigintillion years or 1 googol years)After all the black holes have evaporated (and after all the ordinary matter made of protons has disintegrated, if protons are unstable), the universe will be almost empty. Photons, neutrinos, electrons, and positrons will fly from place to place, hardly ever encountering each other. Gravitationally, the universe will be dominated by dark matter, electrons, and positrons (not protons). By this era, with only very diffuse matter remaining activity, in the universe will have tailed off dramatically (compared to previous eras), with very low energy levels and very large time scales. Electrons and positrons drifting through will encounter one another occasionally and form positronium. These structures are empty atoms. These structures are evaporated, unstable particles, and their algae annihilate, but will eventually reach a very low-energy state. Hata hivyo, baada ya matukio haya, ni lazima uvumi uwe umefikia hali ya chini sana.
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