There a lot of topics and i am sure one of them explains what the theory exactly is if know please send a link or just tell on this topic .
I am curious what this theory really says .
There isn't really one story - you can sort of make it up. There are a few bits of cannon - such as celestial gears and Universal Acceleration, but the workings of these mechanisms are fantastically vague.
The experiments often used as evidence are:
1 Look out of your window
2 Bedford Level experiment
3 That's it