Want CNET to notify you of price drops and the latest stories?
X

Photo: NASA's X-43A scramjet

Monday's flight of the X-43A is to test a type of supersonic engine that uses forward motion for power.

Photo: NASA's X-43A scramjet

Back to: NASA tries to set air speed record

Photo credit: NASA
The pilotless X-43A scramjet, seen here in an artist's conception, carries a type of supersonic engine that uses forward motion for power.