After a total of three Block 1 launches, the Block 1B SLS upgrade with EUS would first launch on Artemis 4; the main difference from Block 1 to Block 1B is a new, larger upper stage developed in ...

SLS and Boeing began organizational changes prior to the coronavirus disease 2019 (COVID-19) pandemic, relocating NASA people working on EUS development to Boeing offices near the program’s home ...

EUS enables two daily launch opportunities compared to Block 1’s more limited lunar launch availability. The Space Launch System (SLS) is a crucial component of NASA’s deep space exploration ...

A key part of the craft is a new booster section, dubbed the Exploration Upper Stage (EUS), which will boost the cargo capacity of the SLS by 40 percent. If Boeing can build it. After a two-year ...