As we have said before the universe must be the same size it always has been and will remain so forever. So we can now look back to before any materialisation had occurred. In this time the universe was only empty space. Now remembering that energy is only motion and space moves, all the energy in the universe must have started from moving space. I think it was Chadwick who in discovering the neutron, noticed how empty the atom is. So we suggest that space in moving caused microscopic collisions all over the universe, which turned to spin and this made permanent particles locked in spin and all pulling space towards them. The start of gravity. Instant action no attraction of mass for mass. In time many clumps of these particles get together and thus are affected by increases of pressure and temperature. Greater complexity eventually enables materialisation to follow naturally.