la forza di gravità e le leggi di Keplero 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
.
FIRST LAW L '
orbit described by a
planet is an ellipse
, whose
Sun occupies one of two fires
.
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.
