The theory of relativity, proposed by Albert Einstein sometime in the early part of the twentieth century is one of the greatest scientific advances of our time. Contrary to what many think Einstein did not actually propose the idea of relativity itself but made great advances and major contributions to the theory. The theory of relativity is a rather complicated type of physics that is generally broken down into two parts including special and general relativity. The theory of special relativity basically deals with the question of whether rest and motion are absolute or relative, while the theory of general relativity deals with particles as they accelerate, particularly as they relate to gravity. While the theory of relativity is not always an easy one to grasp, the following resources will help you further understand the theory.