
All good things come to an end. And the universe is no exception. In about 10100 years (that’s 10×10, 100 times over – so a long time), the universe will be dead, and all that will be left is a relic of the life and energy it once birthed.
Aeons from now, the universe will be nothing but bits of dead photons, electrons and neutrinos – that’s about it, sadly.