MARSHALL SPACE FLIGHT CENTER, Alabama — A high-tech version of 3D printing additive manufacturing (AM) that uses lasers and metal instead of heat and plastic may shape the rocket engine that ultimately powers the heavy-lift Space Launch System (SLS) NASA is developing for large-payload, deep-space missions to Mars and beyond. The first four SLS flights are scheduled to use up the 16 remaining space shuttle main engines (SSMEs) in the U.S. space agency’s inventory. With the first ...

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