"It isn't possible."
That's what they said about man being on the moon
That's what they said about airplanes or flight itself
That's what they said about cell phones
That's what the loving cave men said about fire
No, that's what handicaps said about a man being on the moon. That's what handicaps said about airplanes or flight itself, that's what handicaps said about cell phones, cavemen didn't have advanced enough language to propegate such a point.
The reason all these achievements have happened is because they're possible by utilizing our understanding of physics. Prior to putting a man on the moon, things had been projected into space. It was known that a man could be placed in space, and it's just a step of logic further to put a man on the moon.
Throw a thin piece of paper. Throw a model airplane. Look at a bird. Things fly. It happens. If you scale up the wings obviously it's going to be able to lift a human.
Radio waves have been used for a while before cellphones existed. Radios were pretty much stuff cellphones. I'm pretty sure most people didn't doubt that cellphones could exist.
On the other hand, our current understanding of astrophysics doesn't allow this to happen. Black holes simply can not be created at the size they are asking for. And even if they were, they wouldn't be able to be contained. That's just what a black hole is. It's not even debatable, you can't house a black hole because it will have a greater gravitational pull than the earth on whatever your housing is, and they don't defy gravity. It will be sucked down into the earth. There's a very scientific reason why this won't happen. The others have no scientific reasons why they wouldn't work.
Get it right.