The arrival of fall in south Mississippi means billowing clouds of steam exhaust is in the air as NASA continues a series of RS-25 engine tests at Stennis Space Center near Bay St. Louis. A team of operators conducted another successful 500-second RS-25 hot fire on the A-1 Test Stand at Stennis on Oct. 11, marking the fourth in a series that will extend into 2019. Once again, the hot fire features an acceptance test of an RS-25 engine controller for use on a future flight of NASA’s new Space Launch System (SLS) rocket. RS-25 testing represents a critical step in development of the SLS. A quartet of RS-25 engines, firing simultaneously, will provide a combined 2 million pounds of thrust to help launch the new rocket, that will carry the Orion spacecraft, on missions to the Moon and beyond. Credit: NASA #nasa #spacelaunchsystem #sls #rs25 #rocketscience #propulsion #testing #baystlouis #mississippi #nasastennis #stennisspacecenter