Dears, In the film the Arrival, of Denis Villeneuve, the alien ship apparently subjugates the terrestrial gravity. It's one thing to simulate gravity in space, another thing would be to simulate a gravitational system apart on Earth. Is there at least a theoretical possibility for this? How? The premise is that to simulate a gravitational field equivalent to that of Earth, a system should have the same mass as Earth. So the proposal of the film would be no more than pure fantasy or speculation!