A team prepares a robot – the yellow machine attached to the liquid hydrogen tank for the Space Launch System rocket – for friction plug welding at NASA’s Michoud Assembly Facility in New Orleans. Friction plug welding is a technique

NASA’s Space Launch System (SLS) has taken another step in its preparation for a projected 2018 launch with the arrival of the rocket’s upper stage Structural Test Article (STA). The United Launch Alliance (ULA)-built Interim Cryogenic Propulsion Stage (ICPS) STA arrived at