I think Albert Einstein's theory of relativity is one of the most mind-boggling concepts. It has really pushed by brain for the fiction concepts I've been working on.
I'll start this out by saying, I'm no scientist (or mathematician or physicist...), so I might get some things wrong (feel free to point errors out to me). I also have a simplistic concept of relativity stored in my brain, which is warped by the artistic abstractions and imaginative modifications I come up with.... so... This writing isn't about balancing any equations or being spot on. Most of my research comes from a read of A Brief History Of Time and also Google searches.
Concepts I found on the Internet: 1. The basic idea is that instead of being an invisible force that attracts objects to one another, gravity is a curving of space. The more massive an object, the more it warps the space around it.
2. Gravity has an infinite range, although its effects become weaker as objects are set farther away from each other.
The classic example used to break your brain into understanding relativity is playing a game of ping pong on a moving train.
Imagine the sci fi of that. What if a machine could trick the laws of physics into making two objects that are far apart be considered by universal law to be close together? What if you could curve space so that two distance spaces touched? I know a million shows have used wormholes and portals, but the concept is really much deeper if you really think about relativity.
Think about the relativity of yourself in your real life. How do you bend/shape/warp/curve the family/friends/coworkers/places/gravity around you?