A cloud of hydrogen that should expand by the laws of thermodynamics in an ideal gas or super-fluid is forced together by his own paradoxical outward force versus the surrounding cold dark matter which does not accelerate in the same direction as the force but in reverse direction, forcing the cloud to form an even hotter more massive spherical object (a matter rich region) the pressure in the center of that sphere becomes so hot and so dense it ignites nuclear fusion which result in the first stars, who distribute their excess energy in heat and light, waves equally in all directions, reaching a temporarily equilibrium preventing the cloud to collapse any further, as we know this goes well till nuclear fusion is possible anymore, in the event of the first stars that where much bigger all ended up not as white dwarfs neutrino stars, but as black holes. The neutrino star let us see what happens with all matter (even the dark matter in relation with the first atom), it's a way to find a new Bose-Einstein condensate equilibrium, the positive electrical charge of a neutron star is stripped, only neutrons, no proton to bind any electron or any higher atomic structure, we only observe it as white because it not totally cold and free of foton or ions. The next step is a black hole, which breaks up the neutron in quantum-parts, quarks the excessive energy is distributed in an astrophysical jet as gamma rays, which starts the same process, formation of stars, planets and their evolution, death and rebirth, till all energy is evenly divided over the whole three-dimensional dimension. Our galaxy is the product of a massive star, which collapse violently, the arms of our spiral galaxy are like the planetary nebula our planets evolved from, a byproduct from the formation from the sun. source photo : http://www.sci-news.com/astronomy/science-milky-way-galaxy-may-be-larger-than-thought-02587.html