Aliens, dark matter, string theory, gravity, entropy, bubble theory, the universe, the multiverse, light even... We're so guessing.
The world was flat a few hundred years ago.
Man's understanding is growing, aided by evolving computers. The progeny of our constructs may get it well before we do - if we are able to get it at all.
Then again I might be spouting bollocks.
Best policy - keep an open mind.
:winkold:
Edit - punctuation