Will create a separate post for this thought. Any mass or matter contained densely enough will press and condense matter/energy into new forms and the heavier form will always move to the centre perhaps what caused the Big Bang was merely that the energy at its ore grew so dense and the right quantity to cause a reaction which created the bang. Look at the sun for an example on an extremely small scale. It burns hydrogen while helium is created from this process it moves to the core until one day the sun will run out of hydrogen and burn the helium until it expands and then dies perhaps the Big Bang was a similar process but one trillion times larger scale this the expansion two would be a trillion times larger.