*"1. humans don't have the ability to create super-massive objects

2. no extra-terrestrial interstellar vehicle has visited this planet
3. time travel from the future is impossible
   anybody who's concerned about these things should always wear his aluminium hat"*

Yep and 500 years ago the world was flat. Not saying that those 3 will happen but who know what theories will be changed in 500 years from now.

"There's a hole in my bucket, dear margret, dear margret."