It's just a name given to the expansion of matter in a highly concentrated state, possibly formed when two dimensions (or 'Membranes') collided, creating unimaginable amounts of energy.
...and Big Bang create K-Pop, just as PSY did a few years ago. "Gangnam Style" exploded onto the music scene from nowhere, went viral in ways not even you could possibly imagine, and created, as head of the UN (and fellow South Korean) Ban Ki Moon said, a force for cultural and world peace.
What will you ever achieve in your life that has as much positive impact, Dave...?
@Swede
I've read about that thing in Chernobyl. Utterly terrifying. That area is uninhabitable for at least 150,000 years, remote cameras sent into the room to investigate that Corium Melt were fried because of the unimaginable amounts of radiation it chucks out, and the only 'safe' (if you can call it that!) way of observing such is via a mirror placed at the doorway of that room, down a long corridor.
It is Greek mythology's Medusa for real.
If you look at it directly, you will die.
I trust those at the Joint European Torus can perfect their Tokamak Reactor, and make Fission obsolete with Fusion power.