This reminds me of something I read some time back. It was about hypervelocity stars, stars with escape velocity. These are stars that are moving fast enough to escape the gravitational pull of their galaxy. If they are escaping their galaxy and moving away from the galactic center, they may also be beyond the pull of any retraction. This, in turn, would mean the subsequent post-retraction Big Bang contains less matter than the prior one. Over an infinity of time and thus an infinity of these cycles, there would eventually be too little matter to go bang at all.

So, after that happens, we're back to the originating questions. From where did sufficient matter originate to go bang? And, how did that bang not violate the laws of motion?

To throw a match on this pile: To me, this seems to be science asserting the existence of God. ;)