When one is versed in the history of big bang cosmology one can't help but realize religion has everything to do with it.

A Jesuit priest, Georges Lemaître is the father of the big bang.

source: wikipedia

Lemaître's papers sought to define a "creation like" event.

And God said, Let there be light: and there was light.

His big bang is just science applied to gussied up creation myth. Observing an expansion and assuming that there is an origin to the expansion is the non-sequitur here.

When any expansion occurs on earth there is a cause...and that cause has a cause....and that cause has a cause....ad infinitum. No "origin" can ever be ascribed to any one incident because it is part of a chain of events. Blow up a balloon and it expands. But you had to blow it up. And you had to inhale other air to do so and move the energy from your lungs into the balloon. The same must, by all we have observed, be true with the observable universe. We have never witnessed the origin of matter, but we do witness change.

I'm not out to crucify religion - but when it comes to big bang cosmology, one can't escape the fact that its "origins" are the result of religious minds trying to influence science. As I pointed out...an infinite, eternal universe that has always existed never gives certain gods a chance to perform their hocus pocus and say "let there be light" - because if the universe is infinite and by default, eternal & timeless, that light has always been there!

The big bang was just what the religionists needed so badly in a world that was starting to replace religion with science - a cosmology that begins with a "creation like" event. We see the exact same thing today in a smaller scale with "intelligent design" and the desire to strike down evolution because it refutes religious tenets.

WAY too many folks don't know the history of the "big bang," which was a derisive term coined by cosmologist Fred Hoyle. Like most religious tenets there is a tendency for some to refer to it as absolute fact and not theory. As to your questions above, these observations completely discredit the big bang as any sole source of galaxy movement. This means we are basically back to where we were before the big bang cosmology took over most cosmological thought and subsequent research - albeit with more data at our disposal.