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Hypersonic
 
The X-43A launches from a modified Pegasus booster rocket

A modified Pegasus booster rocket fires to send the X-43A on its record-setting flight on Nov. 16, 2004. Image Credit: NASA

      able to reach speeds equal to or more than five times the speed of sound




Sentences:
NASA's X-43A scramjet set a new world speed record in 2004 when it flew at hypersonic speeds.

The X-43A reached a speed of nearly 7,000 miles per hour, which means it reached a hypersonic speed.



More Information:
http://www.nasa.gov/audience/forstudents/k-4/stories/ames-how-planes-fly-slideshow.html
http://www.nasa.gov/audience/forstudents/k-4/stories/what-is-aerodynamics-k4.html
http://ksnn.larc.nasa.gov/aeronautics.html   →