Universe doesn't have limits - nor is it endless
In my book Demand for Resources (Resursbegär1992:21-22) I pointed out not only the dangers of such a senseless "model" as "Big Bang" but also how this "model" is trapped in a "monotheistic" view demanding "creation", i.e. a "starting point". Not only is such a "starting point" conceptually impossible (apart from its very obvious other limitations, e.g. how do you "bang" in "nothing") but it also fatally misdirects research focus because it assumes "a universe" or "the universe" where there's only universe.
A time trip back towards the "Big Bang" would only reveal a continuing growth of neighboring "universes". The space/time continuum and warping would make the "Big Bang" model laughable.
To my surprise I've noticed how many decently minded people seem to have great difficulties understanding how the great distances and the great limitations caused by the speed of light constant, warps every effort to take even quite small thought steps, say for example only within our own tiny galaxy.