#KEPLERS LAWS OF PLANETARY MOTION PLUS#
These comets have a total mechanical energy (gravitational potential energy of comet and Sun plus kinetic energy) that is negative: $$-\frac The laws modified the heliocentric theory of Nicolaus Copernicus, replacing its circular orbits and epicycles with elliptical trajectories, and explaining how planetary velocities vary.
Some comets are repeating comets, and they are on elliptical paths. In astronomy, Kepler's laws of planetary motion, published by Johannes Kepler between 16, describe the orbits of planets around the Sun.
Kepler's Law of Ellipses (1st Law): Planets move in elliptical paths around the Sun with the Sun at a focus of the ellipse.Newton was the first to determine an explanation for the behaviors. Keep in mind that Kepler's Laws were strictly observational behaviors of planets (and eventually moons), not theoretical explanations of the behavior.
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