It's like an alien plane in the 2016 independence day movie. It's just a bit different in shape, but the hole in the middle is exactly that. in the film was told that an enemy from outer space down to earth to take the earth's core with a drill ray from the hole. but the man in the story has been very advanced and able to stay on the moon, has a fleet of war. hehe. I think when you make this you seem to be imagining a very advanced human future. Thanks @xpilar, I am happy, this is sharpening logic.