Hello;
I'm curious: how do we know (if we do) that all matter and energy in the universe comes from the Big Bang?
Can't there have been, say, a star, a comet, even just a pebble somewhere in space beside the "Big Grenade" (whatever it is called, the Primeval Atom, Original Singularity or anything) prior to its detonation? One that was or was not transformed/burnt/evaporated/plasma-fied in the BB?