The law of gravity
Gravity is one of the four fundamental interactions governing the entire universe . In classical mechanics gravity turns out to be a conservative force that occurs between bodies with mass , and therefore has a ' gravitational potential energy , in theory Ria of general relativity gravity is instead linked to the geometry (non-Euclidean) space-time of and deviates from the straight course, including massless particles, such as the foton .
Kepler's Laws
The three laws of planetary motion are the main contribution of Johannes Kepler, Kepler said, to ' astronomy and mechanics . Kepler derived in part by studying the observations of Tycho Brahe . Isaac Newton was later verified the validity of these laws in light of theory of universal gravitation .
SECOND LAW
The radius vector joining the center of the Sun with the center of the planet describes areas in equal times equal. THIRD LAW
The squares of revolution periods of planets are directly proportional to the cubic 
and semi-major axes of their orbits.
and semi-major axes of their orbits. PALUMBO Piccionelli CARAMEL
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