Could it be possible that gravity is the reason why the universe is expanding? When stars die and some create gravity waves, those waves are expanding at/around the speed of light. The waves then are traveling faster than a planets'/suns' gravity. Therefore the wave would pull in until it passed a planet/sun then it would end up dragging the objects as it passed. Though the gravity is weak; enough dying stars could possibly create the expanding the universe. Does this idea sound even plausible? If it does not, then why?