Look at the roar! The official shot of last week's RS-25 engine test at the A Test Complex at NASA's Stennis Space Center in MIssissippi. NASA's Space Launch System (SLS), the engine that will drive America's next great rocket to deep space, roared on the A-1 test stand on Thursday last week when it powered up for 535 seconds. The RS-25, formerly the space shuttle main engine, fired up for 500 seconds on the A-1 test stand at Stennis, providing NASA engineers critical data on the engine controller unit and inlet pressure conditions. This is the first hot fire of an RS-25 engine since the end of space shuttle main engine testing in 2009. Four RS-25 engines will power SLS on future missions, including to an asteroid and Mars. #NASA #SLSFiredUp #JourneyToMars #rocketscience #technology #heritage #progress #space #exploration #Stennis #Mississippi #aerojetrocketdyne