Quote Originally Posted by elucid View Post
I believe they now have revised some things about the big bang, the particular part about the explosion. They say it was not an explosion but an expansion of time and space that we call the big bang.
That was'nt really a revision. It was always about a rapid expansion. the name 'big bang' originally came from the theory's critics. To answer wayfaerer's question, in general relativity time is considered to be another dimension along with the three spactial dimensions of length, width and depth. Together they form what is known as the "space-time continium". So if space starts expanding, it follows that time would.

Time though has always been a troublesome parameter to define, not least because it is so dificult to quantify it in any way that isn't arbitory.