Sublime

itself and the Earth does not turn around it because of a mysterious force but because it is racing directly in a space which inclines, like a marble that rolls in a funnel. There are no mysterious forces generated at the centre of the funnel; it is the curved nature of the walls which causes the marble to roll. Planets circle around the sun, and

the total energy, that stays constant over the ball’s trajectory:

“weight” isn’t an intrinsic property of an object, because it depends on the amount of gravity pulling on it—your