escape velocity
  • noun the speed that an object must reach to escape a gravitational field
  • The velocity needed to escape completely from the gravitational field of a planet or other object, 11km per second in the case of the Earth
  • The minimum speed a particle or body must attain in order to escape the gravitational field of a celestial body, such as a planet or a star. For the planet earth, this velocity is approximately 11.2 km/sec.

Not what you were looking for?