First, stop looking at physics in such a black and white way. If you're thinking along these lines, your teachers haven't prepared you as well as they should have, or you've been thinking these thoughts instead of listening to them.  Second, energy isn't a "thing", energy is a property of things.  Third, well, Sensei covered the first dimension mistake.  Fourth, the Big Bang wasn't an explosion. It was an expansion, and the theory describes the evolution of that expansion from an