As an aging star begins to deteriorate and die, one of the possibilities is that the star reaches a critical mass where as the outer layers are too heavy, and the core can no longer support its immense weight. When this happens the star collapses in on itself until it cannot collapse any further. The rapid implosion of matter comes to a halt when it cannot fall any further, and that energy is transformed into a massive shock wave that bounces back away from the core in all directions taking all of the matter with it in a monstrous explosion called a supernova . The most common breeding ground for stars is a nebula. These masses of interstellar dust and glowing gas contain essential elements for the composition of stars.
Many nebulae have young stars forming at the same time.
The intense radiation given off by the new stars fueling themselves causes the surrounding gases to glow which in turn gives the nebulae its ethereal luster. The solar nebulae is comprised of essential elements for the production of new stars. Those most essential element is hydrogen. As the cloud of gas is pulled together, it becomes more dense and opaque. Once this stage is attained, the effect that gravity has on the mass begins to accelerate.