NASA Contracts With Aerojet Rocketdyne to Restart RS-25 Engine Production for SLS

The opening salvo of four Space Launch System (SLS) flights, beginning with Exploration Mission (EM)-1 in November 2018, will contain a core stage powered by four clustered RS-25D engines. Image Credit: NASA

More than four years since three of its kind were last fired in anger, on 8 July 2011, to deliver Atlantis’ STS-135 [...]