The Big Bang

If the “big bang” created the universe, and if nothing existed before the big bang, where did the big bang come from?

Imagine an infinite sea of energy filling empty space, with waves moving around in there, occasionally coming together and producing an intense pulse. Let’s say one particular pulse comes together and expands, creating our universe of space-time and matter. But there could well be other such pulses. To us, that pulse looks like a big bang; in a greater context, it’s a little...