The big bang part is interesting, because, if humans become successful and manage to somehow make some sort of long-lasting archive that would survive on universal scales, we would be the ancients with old revelations to a potential future species. Able to impart knowledge that would have been undetectable for them, and an ancient map of the stars containing visions of countless other galaxies, and a peek into the very beginnings

Though, realistically, it's likely that a hypothetical hyper-advanced technological species would have their ways of prodding the true nature of our universe, despite the greater challenges