The theory of an invisible magical force doesn't need proof? You're all fucking insane, there's no reason here just mad men pushing a giant lie and conspiracy.
What is your definition of proof of existence? If we assume that it exists, all things make sense. If we assume that it doesn't exist, nothing that relies on it existing works anymore. I can say that gravity, however you want to define it, will always do the same thing we expect it to. Whether you want to call it gravity or ytivarg, it doesn't matter, it exists because there is no proof that it doesn't exist. Maybe you are right, and what we call gravity is actually some mysterious force + some effect due to ether or whatever, but those components will equal what we consider gravity. So until a more accurate model is found, we'll call it gravity and it'll be an acceleration of 9.80m/s^2 at the sea level.
I can tell you with 100% certainty, that a 32 mile wide thermonuclear reaction 3,000 miles away would destroy the earth, so that is why I don't believe the sun is the size or distance you claim, not because someone told me. If you set up solar panels, you can get an amount of power from them. That power is very closely related to the ~1400w/m^2 that we get from a sun considered 93 million miles away.
My greater point is, if you are going to claim there is no gravity, or that the sun is 3,000 miles away, please explain how that holds true to what we can observe or predict with some sort of consistency. Put the pieces together for us, and if it holds, it holds. Keep in mind, that if you change assumptions about gravity or the distance from the sun, you can't make the same assumptions that the experiments that prove your point still hold true, so make sure you double check that. Describing something as a function of something else that you claim doesn't exist isn't great math. I can claim the earth is a triangle, because you can go up. But until I unify that theory with proof, theres nothing to talk about.
On a side note, I mean, you could wait 10 years until a trip to space costs the same as a plane ticket to observe for yourself. Or just launch your own weather balloon with a camera for a whopping ~$300 cost.
*edit* Sorry, I didn't ask the real question here. So if gravity doesn't exist, what does?