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Escape velocity is the speed at which an object (like a rocket) has to travel to completely overcome a planet or moon's gravity and make it into space away from that planet or moon.
A planet (or satellite) cannot long retain an atmosphere if the planet’s escape velocity is low enough to be near the average velocity of the gas molecules making up the atmosphere.
At the surface of the Earth, if atmospheric resistance could be disregarded, escape velocity would be about 11.2 km (6.96 miles) per second which is approximately 33 times the speed of sound (Mach 33).
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