The Big Bang is impossible.
There are only two options; either all the matter in the universe came from nothing in an instant, or it was always there. Both propositions are difficult for us to comprehend, but since space itself is absolutely solid with subatomic "dark Matter", and space appears to be infinite in size, the idea that it all came from nothing in an instant is not in any way credible. Time actually is meaningless, since it only is the relative occurence of events, as perceived by humans, and as far as God or any non-human is concerned there is no such thing as time. So the fact that something has always existed is not a problem. Either something exists, or it does not. We all know that it humans and the Universe, do exist; therefore there is not a problem. Existence is a fact; time is only something perceived by humans as a fraction of their own memory of events; permanence is a fact. Something cannot arise from nothing, it does exist, and in some form or other has therefore always existed.
The only reason given for a big bang theory is the undoubted fact that light eventually reduces its wavelength as it travels great distance. This should be hardly surprising. If a waveform travels for ever, it must eventually slow its wavelength and eventually cease altogether. It is only a wave in the ether of the cosmic "dark" subatomic matter anyway.