The Big Bang is the ultimate source of energy in our current cosmos. At the beginning of time, all of the energy was created, and as the cosmos expanded, numerous stages of particulate matter were produced from that energy.By the time of the Modern Universe, energy had been dispersed as mass, kinetic energy, chemical energy in lumps of matter, or radiant energy. Galaxies and stars inside them are used to classify the masses. The sun is one of those stars, and it received its energy from the Big Bang.