1The Seam · 2The Department of Saying It First, at 4am
In Penrose's picture the remote future of an aeon contains no massive particles: matter decays, black holes swallow what is left and then evaporate by Hawking radiation, and the universe is filled with photons and other massless fields [1]. That is the state of highest entropy the aeon reaches. It is also, in plain words, nothing but light.
limt→∞ (universe) = light (1)
The next aeon begins from that light, rescaled. We therefore propose the units:
1 glow ≡ the entropy of one aeon at its end (2)
and note that every aeon begins as nobody: minimum entropy, waiting for someone to keep talking to it.