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escape velocity tondâ-ye goriz Fr.: vitesse d'échapement The speed an object must attain in order to free itself from the gravitational influence
of an astronomical body. It is the minimum velocity for the object to enter
a parabolic trajectory. The escape velocity is given by:
G is the → gravitational constant, M is the
mass of the astronomical body, and r is its radius. The escape velocity
of the Earth is about 11.2 km s^{-1}, that of the Moon is 2.4 km s^{-1},
and that of the Sun about 618 km s^{-1}. |