Hello! Don't flame me because i'm not a physicist/cosmologist. But I am really interested in this field. Mostly I would like to know how far has science come to understanding what happened before the big bang (I heard LHC is working on something related to this) and what are the theories - how Universe was possible to begin? Is there even a beginning? Is it even possible to find out? Sometimes when you start thinking about the scale and age of universe, you get this really weird feeling that something like this could've happened out of nothing. I would really like to hear theories about this, so I can research further.