Hello, I've wondered about this idea before, and thought I would put this together and get some opinions. When it comes to electricity and magnetism, electricity can generate magnetism, and a moving magnet can generate an electric current. When it comes to mass, gravity, and space/time, has there been a theory put forth were a mass moving through space/time will generate gravity? And, I suppose, would this mean the generation of gravity (if we could do that) would result in the existence of mass? To me, it's a real puzzle as to just exactly how gravity is generated. It just seems like an odd characteristic of our universe that gravity is ever-present, constant, and everywhere evenly. When I say evenly, I'm referring to the fundamental bits and not the variations involved with the size collection of mass. Thanks for reading the post.