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the big bang is a theory that all of the universe in it's unlimited entirely it exploded from incresing pressure and gravity and thus suping out stars nebulas sloar systems galaxies and black holes.
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The Big Bang was the point of the beginning of the Universe. Space-time suddenly began to expand explosively (often referred to as the 'explosion' of the Big Bang. In seconds the Universe that 'before' the Big Bang was smaller than a proton had expanded beyond the size of this present solar system. At the moment of the Big Bang, the Universe was billions of kelvins in temperature and extremely dense. The Big Bang occurred about 13,7 billion years ago. Evidence for the Big Bang includes the red-shift of receding galaxies and the microwave background radiation, radiation that has been stretched to microwave-length across the infinities of space-time from the Big Bang to the present.