Get to know your Universe. Introducing space-time fluid. It is the state of an energy we call dark energy that expands the rate and size of the universe. For decades I have said this spacetime fluid is produced by black holes which are growing in number and size.

97% of the Universe will never interact or connect by photons at the speed of light because the expansion keeps things apart faster than the speed of light can overcome. That is one big universe beyond an observer's sight horizon. That is a lonely universe.

The original spacetime fluid came from a quantum state change we call the Big Bang.