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Home The Space Launch System (SLS) core stage pathfinder, which is similar in similar in size, shape and weight to the 212-foot-tall core stage, arrived at NASA’s Michoud Assembly Facility early in the morning on September 27, 2017. (NASA/MSFC/MAF/Steven Seipel) The Space Launch System (SLS) core stage pathfinder, which is similar in similar in size, shape and weight to the 212-foot-tall core stage, arrived at NASA’s Michoud Assembly Facility early in the morning on September 27, 2017. (NASA/MSFC/MAF/Steven Seipel)

The Space Launch System (SLS) core stage pathfinder, which is similar in similar in size, shape and weight to the 212-foot-tall core stage, arrived at NASA’s Michoud Assembly Facility early in the morning on September 27, 2017. (NASA/MSFC/MAF/Steven Seipel)

The Space Launch System (SLS) core stage pathfinder, which is similar in similar in size, shape and weight to the 212-foot-tall core stage, arrived at NASA’s Michoud Assembly Facility early in the morning on September 27, 2017. (NASA/MSFC/MAF/Steven Seipel)

The Space Launch System (SLS) core stage pathfinder, which is similar in similar in size, shape and weight to the 212-foot-tall core stage, arrived at NASA’s Michoud Assembly Facility early in the morning on September 27, 2017. (NASA/MSFC/MAF/Steven Seipel)

The liquid oxygen tank–shown here as technicians inside the tank complete final welds to plug holes left by the robotic welder– is undergoing the first hydrostatic testing for NASA’s deep-space rocket, the Space Launch System (SLS). (NASA/MSFC/MAF/Jude Guidry)
To understand the aerodynamic forces as booster separation motors fire and push the solid rocket boosters away from the rocket’s core, engineers at NASA’s Langley Research Center are testing a 35-inch SLS model in Block 1B 105-metric ton evolved configuration in the Unitary Plan Wind Tunnel using a distinct pink paint. (Dave Bowman / NASA)