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Escape Velocity
 
With a blue ocean and sky as the backdrop, smoke and steam surround the launch pad as a spacecraft lifts off

NASA's New Horizons spacecraft is the fastest ever launched, speeding away from Earth at an escape velocity of 36,000 miles per hour. Image Credit: NASA

       the speed needed for an object to break away from the gravitational pull of a planet or moon


Sentences:
After blastoff, the space shuttle has to go seven miles per second to reach the escape velocity of Earth.


More Information:
http://www.aeronautics.nasa.gov/fap/all_about_flight.html   →
http://www.nasa.gov/audience/forstudents/5-8/features/orbit_feature_5-8.html


 
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