Quote:
Originally Posted by sharpiel
If all the energy is confined to a single closed system (one universe) then is it possible to lose any energy at all?
|
I would think not. However energy can turn into matter (at least theoretically) and vice versa.
http://www.nature.com/nphoton/journa...n.2014.95.html
No idea what would trigger the reversal of expansion into contraction though