Big progress yesterday! NASA engineers successfully conducted the second in a series of RS-25 flight controller tests on May 23, 2017, stepping closer to deep space exploration with the world’s most-powerful rocket. The test was set after a facility issue, subsequently resolved, forced rescheduling of a May 16 hot fire. The 500-second – more than eight full minutes – test on the A-1 Test Stand at NASA’s Stennis Space Center in Mississippi marked another milestone toward launch of NASA’s new Space Launch System (SLS) rocket on its inaugural flight, known as Exploration Mission-1 (EM-1). More on nasa.gov/sls Credit: NASA #NASA #SLS #SLSFiredUp NASAStennis NASA_Marshall #engineering #technology #rocketscience