Quick theory, the reason that the UFO you have been seeing is so much faster and seems to be based around gravity is that they are not from space. What you are seeing are drones sent out from the inside of the planet. The gravity is much stronger so they had to figure that out, but they are direct descendants of the anunnaki here to keep an eye on us. Until the planet gets close enough. Which is why sightings are increasing. Its like the story of superman. A humanoid from a planet that is harsher than ours like gravity comes to earth and is faster than anyone stroger than anyone. If you had equipment to work effectively near the core where gravity is extreme it would by god like on the surface, and space.