Well that depends entirely on which theory of gravity you believe in. I personally like the whole anti-theory about gravity being produced by vacuums, because

Well that depends entirely on which theory of gravity you believe in. I personally like the whole anti-theory about gravity being produced by vacuums, because when you argue it against someone unknowlegable it makes pseudo-sense. However anyone with any clue of physics knows this is the easiest debunked theory in the world. I mean vacuum tube factories would have exploded in anti-gravity force.