Situation, a empty universe where there are only concentric spherical shells of mass dm spaced apart by distance dx and contracts under gravity to form a sphere. Assume that there is a point mass in the middle of all the shells. I don't think it would work without it. case1 is an inelastic universe. case 2 is an elastic universe. case1: There is potential energy in a separation of masses because they have a natural tendency to accelerate towards each other. As infinitely far away concentric shells contract, they contract faster and faster. As the shells of masses fall on top of each other, they hit the uncompleted sphere at slower and slower final velocities. Because the uncompleted sphere is not moving, it has internal energy. So the internal energy of the inner parts will be more than the internal energy of the outer parts. Until it all evens out. So what we should have in the end is a vibrating sphere of mass M( sum of all the dm). Case2: the first concentric sphere will rebound off of the center point mass and have an radially outward momentum because this collision is completely elastic. The second shell seems like it will have less momentum, but it was further away by an amount, say dx, resulting in the equal but opposite momentum with the second shell. This causes an inelastic rebound of the second of the second shell and so on. Finally, the last shell will just rebound, then the second to last, and so on. So the sphere will just disassemble itself in an elastic universe. And this process will just keep oscillating in an elastic universe. So in an elastic universe with only these concentric shells, it will just be a continous formaton and deformation of a sphere of mass with time. Is this logic correct?