Everything, Nereid. That's the beauty of the Mable Theory, it requires only gravity to operate. There is no need for any of the 'repulsive' forces (Big Bang, Dark Energy) that really nobody can understand. My theory is based on the Laws of Newton, Bernoulli, Boyle, and the Joule-Thomson Effect. I also agree with Einstein, that the Cosmological Constant was indeed,the 'greatest blunder' of his career. All I am trying to do, is put the 'Science' back in Astronomy.