Which of these choices states Newton’s law of universal gravitation? 1) As a planet moves around its orbit, the planet sweeps out equal areas in equal amounts of time.
2) The orbit of a planet, or other body, around the sun is an ellipse with the sun at one focus of the ellipse.
3) The square of a planet’s orbital period is proportional to the cube of the planets mean distance from the sun.
4) Gravitational force increases as the mass of an object increases or as the distance between two objects decreases.