Light still enters a vacuum which proves that its not empty so the mechanism that orients objects vertically and relative to their density is still functioning and its false to assume otherwise without evidence. So objects like a feather and a bowling ball will still move downwards because the other substances or particles like light and even the ether in the chamber are less dense than those objects. And they fall at the same speed because density doesn't affect the rate of acceleration, only their positioning, without significant resistance through a fluid or air.
And a hot air balloon proves that gravity doesn't exist by the current definition because gravity is the supposed attraction of mass yet a hot air balloon weighs 800 pounds at minimum yet it still rises in the air which gravity can't cause. When the air inside is heated it expands and causes the overall structure its attached to including the balloon and bucket to be less dense than the substance it displaces which is the surrounding cooler air, particles and gasses.
The same phenomena is found in a cruise ship which weighs 220,000 tons. That's 110,000 cars. Picture that for a second and try to fathom how heavy that is, yet "gravity" is so weak, actually non-existent, that it can't even pull it through a thin substance like water. Why? Because the air contained in the ship, just like an upside down hot air balloon, causes the entire structure to less dense than the total volume of water it displaces. So the weight pushes it downward and displaces the water but the air inside prevents it from going further due to the shape and since objects are only oriented vertically.
Furthermore, there isn't a single experiment to demonstrate that mass attracts. Even the cavendish experiment is a laughable and desperate attempt to prove that gravity exists while the suspended objects sit there idle without air currents, human interference, or tension in the string. Set two bowling balls next to each other on a flat surface and watch them do nothing. Mass alone does not attract; attraction is due to electromagnetic phenomena and objects can move up or down relative to their density from an unnamed mechanism. Gravity is fiction that cannot make objects rise, cannot pull an object downwards with 220,000 tons of weight to help it, and was invented by atheists to try and support the irrational and unscientific delusion that a flat surface ocean is somehow curving around the bottom of a ball and sticking on the outside.