I don’t understand it at all, it may be that no one understands it in a real sense, but this is what I understand from Dr. Gerald Schroeder’s book: “The Science of G-d”
- If you were to travel on a light beam that leaves a star 100 light years away from earth.
You look at your watch as you leave the star, you look at it again when you arrive on earth, ZERO time will have passed for you and for your watch. But to the people on earth, if they could somehow have observed your voyage, they would measure that 100 years had elapsed from the time you left the star until you got here. Something like that.
Depends on the persective of the system you are in relative to the other system of interest. I think that is also kind of the nutshell of the theory in general