as promised, here is the alternate theory to gravity.

first a little note, scientists can not prove that gravity exist. They can only measure it's effect on things. Einstien's best explanation on gravity was a bowling ball on a bed, a heavy object bending space. Some scientists even discuss it in multiple dimensions. but could gravity be an optical illusion?

Let me explain this in a simple form. For this simplistic view we will set up a hypothetical universe. Imagine that in this universe, there are only two objects. You and a planet size sphere, which you are standing on. In this hypothetical universe, there in no gravity. At least not in the convention way, meaning all objects are attracted to each other. The only rule here is that all objects are constantly doubling in size. You wouldn't notice the doubling, because you and the ball would both remain in the same proportions. You wouldn't feel you matter doubling any more than you feel your atoms activity now. (you don't feel your cells dying, nor do you feel the earth spinning around the sun at a high velocity. Thus the doubling is possibly without notice.) The only effect you would see is the supposed gravity. The balls growth would be constantly pushing against you and you against it. If you tried to jump away from the ball, there would be a momentary space created, but the doubling will fill the gap instantly. No gravity, it would just look and feel like it. Visually it would seem that the ball has more "gravitational pull" than you do, because you seem to be attracted to it and not it to you. This corresponds with our current view of gravity. Imagine a bowling ball and a marble. Double them both in size. The marble would look like a marble, but the bowling ball would seem huge. Larger objects when doubled, seem to have a larger impact in relation to smaller objects. Thus, the illusion that bigger objects have more gravity. Now move this hypothetical universe to our own. The only new rule you would need to add to this for the Expanding Matter Theory to work, and that is a universe where all the planets are moving awy from one and other. It appears our universe is expanding. There really isn't anything that stops this from working.

This theory was persued by one physicist a few years back. But he had no luck, since this could not be proven experimentally and because he was a "heretic" for challenging the conventional views of the universe. Wasn't there some guy named Copernicus who got killed for making the "radical" claim that the sun was the center of our galaxy? But wasn't he right?