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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:
GM/r)^{1/2}, where 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}. The escape velocity from the Sun
is about 618 km s^{-1}, and the solar escape velocity from Earth's
orbit is about 42.1 km s^{-1}. |