Question

Can someone please explain to me the big bang theory as detailed as possible, if not, a simple answer would do.
Thanks :D

Answer 1

The Big Bang theory is that at the start of the universe, it was a very tiny, very dense, very hot speck and the stuff that is everything we can see now was scrunched up in there. The BB then happened and "everything" expanded really, really fast and the universe started to form itself into what we see now. (That is a gross simplification BTW.) The idea that the universe used to be a little dot of everything is quite difficult to get your brain around and I am not sure that I yet have. (I am not brave enough to answer your relativity question but somebody will be along later I am sure.)