You just posted this question using technology of modern science.
The assumptions are looking good at this level!
As for the theory of the universe, the theory of gravity, matter, quantum physics and dark matter/dark energy, I agree that it is a stretch and most is still unconfirmed theory. But they are theories, not assumptions..
I lost it at the speed of light is a constant when it you can see it bends in water.. if it bends it must slow down on the inside of the curve..!







