What is Exploration Upper Stage?
The '''Exploration Upper Stage''' (EUS) is a top stage of the [[Space Launch System]] (SLS) Block 1B. It will use four RL-10 engines burning [[liquid]] [[oxygen]] and liquid [[hydrogen]] to generate {{convert|440000|N|lbf|abbr=off}} of thrust. The first flight of SLS with EUS will be in 2023. == Related pages == * [[NASA]] * [[Space Launch System]] [[Category:Rockets]] {{tech-stub}}