Playing Ball in a Space Station.

The article illustrates a mathematical equation on ball dynamics on a planet and the comparison of its gravity to two rotating spacecrafts. If a ball is thrown to the earth from Asteriod B-612 which is 35 feet in diameter and has the same gravity as the moon, it would follow a path of parabolic shape. If the ball moves too fast, the parabolic shape and flat earth model breaks down since downward acceleration is not constant and the earth is curved. Following the principles of scientists Isaac Newton and Johannes Kepler, a ball that is thrown so fast follows a parabolic, hyperbolic or elliptical path. If a ball is thrown from spaceship Discovery, with sphere of 40 feet in diameter, air resistance is ignored and the mass of the space station does not affect the motion of the ball.