Thanks for this answer.
I guess that means that if all the energy in the universe were to be simultaneously released into free form, there would now be lower energy density than at the time of the big bang (as it would be spread over a larger volume). Is there any way to confirm this though?
I know nothing about physics, but it would be great to get an answer to my questions of anyone can help:
1) If everything that exists does so within the universe, does it make any sense to say that the universe 'grows'? Against which yardstick is any growth being measured?
2) Would the energy...