It just occurred to me that the title of this thread may have a slight inaccuracy. The idea is that 3 things are needed for a universe, mass, energy, and space. I suppose you could have a universe with just those 3 things, but it would be a really boring universe, since nothing would change. For change to happen you also need time. Without time a universe would be stuck in one state for eternity. Kind of like a photograph. The scene in it never changes.

I understand that some theorists have said that time may not really exist it is just an illusion. But that never made much sense to me.

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.