Propulsion
The X-15 launches with its rocket engine ignited

Rocket engine propulsion made this airplane fly faster than the speed of sound. Image Credit: NASA

      the force that pushes forward or drives an object forward




Sentences:
NASA is studying new types of propulsion to travel farther and faster into space.

We built a toy rocket that used baking soda and vinegar to make its propulsion.




More Information:
http://www.grc.nasa.gov/WWW/K-12/airplane/bgp.html   →
http://spaceflight.nasa.gov/shuttle/rtf/images_coleman/propulsion_systems.jpg   →