I'm about to do something terrible, but it helped me immensely to understand the Big Bang. Let's pretend we have a magic box that tells us how space expands ove

I'm about to do something terrible, but it helped me immensely to understand the Big Bang. Let's pretend we have a magic box that tells us how space expands over time: V(t) So, t starts at '0', which we're gonna call 't0', and goes until 'now'. So V could be small, it could be big. We don't know, and it kinda doesn't matter. The reason is that the way the Big Bang works is like this: (t - t0) * V(t) So, when t == t0 (the beginning of time), it doesn't matter what shape space (V) has, the size of the universe (spacetime) is '0'.