Einstein's Theory of Gravity is different from Newton's. In a sense, Newton just asserts that two things will always be attracted to each other according to his Universal Law of Gravity. But Newton does not give any other reason than to just say that it is so. Einstein, however, actually gives a reason. What is the gist of Einstein's reason that there is a gravity? Einstein said mass bends spacetime and because of this curving of space and time, other masses then travel by in this curved space. And this makes it so that the masses travel along curved trajectories like parabolas and elliptical orbits. O Einstein said a remarkeable thing: gravity, electricity, and magnetism are all actually the same force. Einstein concluded that mass and electrical charge, and magnetism are all based upon the same basic fundamental issue