Supersonic test aircraft aimed to reach 260 mph at altitude of 20,000 feet.

NASA's experimental supersonic X-59 jet designed to travel faster than the speed of sound is preparing for its second flight from California.

NASA fired up RS-25 engine No. 20001 at the Fred Haise Test Stand at NASA’s Stennis Space Center at Bay St. Louis, ...

Watch how the Space Launch System rocket RS-25 undergoes a core stage engine test-fire. Credit: NASA's Stennis Space Center ...