But what did that have to do with/was dependent on the black-hole? And, I just don't see the equation being that hard.
Really?
I am bewildered at the fact that MOST professional physicists today have no idea what gravity is 100 years after Einstein first put forward General Relativity. Not only is gravity not easy, most have skipped real understanding and rely on
the math works and really bad visualizations of how it works.
I went to this movie because the trailer struck an emotional cord with me and was expecting to have to sit cringing through the science aspect. I was amazed at what I ended up with... until I was looking at the credits and saw that Kip Thorne had worked on this (I had met Professor Thorne when I was a student at UCSD and his book
Gravitation, co-written with Charles Misner and John Archibald Wheeler, is the best text on the subject).
That having been said, I did cringe a bit when they went to a place where the time differential was one hour to seven years. The operative aspect of gravity that we fight against is time... and the amount of energy needed to get away from Earth (a differential of one year to one year and the smallest fraction of a second) is daunting, so how would they be able to get away from where that planet was?
But yeah, gravity is a subject that most physicists have avoided because it is hard. The mathematics is hard, the concepts are really hard (it is amazing that Einstein had the theory before he had the math) and it isn't something that you can manipulate which rules out experimentation (and leaves you with only observations). The Professor Brand character was a good surrogate for where we are in physics today with gravity... we feel helpless to make any further progress because we can't manipulate it in any meaningful way to experiment on it. And part of the reason for people looking for a
new theory of gravity is because the current theory makes us feel helpless to explore it further (it isn't like there could be an LHC type project for gravity).
So until we can see gravity in real extreme situations, we'll never really make any significant advances... and the only place were those types of conditions exist are near black holes. The problem is that once you have the observational data, you are no longer able to relay it to the rest of the universe. Once you have the answers, you can't share them with anyone.
The energy needed to put a few people in low Earth orbit is massive, to move billions away from Earth completely... it can't be done conventionally. Without something else, (as the movie put forward) there was really only ever
Plan B.