Interestingly, most people think that the big bang has already been worked out, but they don’t realize that there are differing versions of the big bang model—and not everyone agrees. By inserting a few unprovable assumptions at your starting point, you can end up with virtually any model you like. The big bang assumes that the universe has no centre or edge. Not only is this not proven, some recent research on redshift patterns have badly damaged its credibility by indicating that our galaxy is at, or near to, the centre of the universe.
Hartnett, J., cited in Bates, G. (2003). Exploding the big bang!
An interview with creationist physicist/cosmologist John Hartnett. Creation Ministries International. Available http://creation.com/exploding-the-big-bang. Last accessed 14th Mar 2015.