Cosmic Strings are thin pieces of energy that were created during the big bang, They are so thin that they are considered to be 1 dimensional, at least when viewed from 4 dimensional space. They may not even exist but it would be cool if they did. Move a small one close to a planet and the gravitational pull is so great that you could move the planet at will. Assuming of course you could move the string first. A large one would be able to move a sun. Powerful stuff!
Anyway, here it is