The Big Bounce Theory

the bouncing universe

The Big Bounce theory is yet another theory related to the  the formation of the known universe.This theory points out that a Universe existed at a point before the Big Bang.According to some oscillatory universe theorists, the Big Bang was simply the beginning of a period of expansion that followed a period of contraction. In this view, one could talk of a Big Crunch followed by a Big Bang, or more simply, a Big Bounce. This suggests that we might be living in the first of all universes, but are equally likely to be living in the 2 billionth universe (or any of an infinite other sequential universes).The theory simply means that the expanding Universe finally meets it maximum size,and the gravity pulls galaxies closer,thus shrinking the Universe itself into a single point,and the Big Bang happens again.This   process keeps repeating on and on. 
To fully understand the theory of the Big Bounce one must know about the theory of the Big Crunch.