[Phantasm]

It's 11,019, and they're still debating what caused the Big Bang and what came before it, as new evidence including particles discovered - some quite by accident - in the intervening millennia that cannot be explained by the Standard Model has rendered every proposed model incomplete.

It seems the only way to truly be sure is to construct a temporal viewer, but the key technology needed to make one has been banned by every nation because of its destructive potential. Especially since you'd have to set the viewpoint to outside the universe proper....