NASA followed up the first RS-25 test of 2018 with a second hot fire of the Space Launch System (SLS) engine on Feb. 1 at Stennis Space Center near Bay St. Louis, Mississippi. The full-duration, 365-second certification test of another RS-25 engine flight controller on the A-1 Test Stand at Stennis comes about two weeks after a Jan. 16 hot fire. The test marks completion of green run testing for all four of the new RS-25 engine flight controllers needed for the second flight of NASA’s SLS rocket. NASA is building SLS to send humans to such deep-space destinations as the moon and Mars. The Exploration Mission-1 (EM-1) flight will test the new rocket and carry an uncrewed Orion spacecraft into space beyond the moon. Credit: NASA #nasa #sls #rocketscience #engineering #deepspace #exploration #slsfiredup nasastennis nasa_marshall