Hi I'm not very clued up on the mathematics behind these things and I tried searching for relevant threads but everything I found was a bit over my head so sorry if this has come up loads of times before but I was hoping someone might be able to explain in simple terms the reasoning behind them. Anyway, I've been thinking about singularities and can't understand how they could exist. If you were at the centre of gravity of an object like a collapsing star, or anything else for that matter, you would be weightless. No matter how small the object became there would still have to be a centre of gravity with no net gravitational pull. So how could a singularity ever come about? surely if the centre of a mass has zero gravity then singularities are impossible. And therefore the big bang can't have come from a single point either, is this correct?