Gravity
Lift a pétanque boule and throw it straight up. It will ascend for a while but soon it will fall to the ground. What can be deduced from it? There is a force affecting the boule that slows it down and accelerates downwards. Otherwise, in accordance with the law of inertia, it would move at a constant velocity. This effect cannot be explained by mere environmental resistance. Firstly, the relatively aerodynamic sphere would slow down much longer. Secondly, the air resistance along with the inertia would block the boule, not force it to fall. There must be something else going on. The Flat Earth Society offers three explanations: hydrostatic buoyancy, acceleration of the Earth, or electromagnetism. Let's start with the electromagnetic theory. I t is based on paramagnetism. Paramagnetic materials, such as aluminum, barium and calcium, are attracted by (any) external magnetic field. So, in theory, the Earth would not have to be gravitational but rather it would attract ob...