any object that moves through the air or through space under the influence of gravity
the curved path followed by a projectile under the influence only of constant gravity
a projectile or small celestial body that orbits a larger celestial body
the oval path followed by a satellite
Law 1: The path of each planet around the Sun is an ellipse with the Sun at one focus.
Law 2: The line from the Sun to any planet sweeps out equal areas of space in equal time intervals.
Law 3: The square of the orbital period of a planet is directly proportional to the cube of the average distance of the planet from the Sun.
the speed that a projectile, space probe, or similar object must reach to escape the gravitational influence of Earth or of another celestial body to which it is attracted