The fourth dimension is inside and outside, 4D shape of the universe is unknown because matter has the inside of the inside, and the outside of which unknown.
The movement towards the inside and the outside may causes vaccuum which causes fields including the field of gravity and the expansion of the universe.
Energy always moves, and it tends to occupy vaccuum.
The movement towards the inside and the outside may causes vaccuum which causes fields including the field of gravity and the expansion of the universe.
Energy always moves, and it tends to occupy vaccuum.
