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The history of the Universe Part 5 of 5

5) The Dark Era (the dark era)
From a Quindezillion (10 ^ 90) years after the Big Bang ...
we look so far into the future, then, the accuracy of our predictions from more and more. What is certain is that all the processes that have been reported, leaving background radiation. In our era have mainly red dwarfs radiation released into the environment incident to the era of the white dwarf star in the first place by the extinction dark matter in its interior, it was followed by the decay of protons liberated radiation as the main source of radiation in the universe and finally came to the dating of black holes, Hawking radiation. This brings us to the beginning of the dark era in which there are no stellar body more - only remnant of positrons, electrons, neutrinos and photons from the previous ages.
surprisingly dark in this era is that the universe is not dead yet. For example, protons, positrons, often leave when they decay. It is for each positron in this dark future as an electron counterpart. Electrons and positrons together to a so-called form positronium atom, which is basically a hydrogen atom with a positron instead of the proton. These atoms are now artificially produced, but exist only for the tiny fraction of a second and are microscopic.
In the dark ages but, in far distant future, such a positronium atom is larger than our Milky Way today, even as large as the whole of today's existing universe because the universe is allowed by its almost total emptiness of the existence of such a giant atoms . Also such atom decays by the mutual annihilation of positron and electron can not immediately but over a period of 10 ^ 145 years [Note: for I think there's no word] as they move from higher to lower energy levels and ultimately disappear, and they left very long wavelength photons.
And unto this last remnant of radiation from the nothing is left, what was once the universe ...

[Note: The last part of the text is highly speculative and not at all likely, since the cosmological constant
in our universe appears to be nil, and this in the further text the course included speculation
impossible]