Exploration Upper Stage

The Exploration Upper Stage (EUS) is a rocket stage under development for future flights of NASA’s Space Launch System (SLS). Designed for use on the SLS Block 1B and Block 2 configurations, it will replace the Interim Cryogenic Propulsion Stage used on the Block 1 variant. The EUS will be powered by four RL10C-3 engines burning liquid oxygen and liquid hydrogen, generating a total thrust of 433.1 kN (97,360 lbf). Its first flight is planned for Artemis IV in 2028. However, the Trump administration has proposed terminating the SLS program after Artemis III, which would eliminate the need for the EUS, though Congress in July 2025 provided funding for Artemis IV anyway in the One Big Beautiful Bill Act.

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EUS
rocket stage, Boeing Defense, Space & Security, United States, 
United States, Ashkenaz, Calvinist Republic of Ghent, Chinland, Democratic Republic of the Congo, Havilah, Kingdom of Martabam-hongsawatoi, Kingdom of Wolaita, Persia, Reman, Sikh Confederacy, Tarshish, Dong Fang Hong 2, Ekran, Republic of Haiti, 

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Frameless

SLS EUS 2017

SLS EUS 2017

Exploration Upper Stage 2019

EUS VS SIVB

Manufacturing and testing the first in a series of initial weld confidence articles for the Exploration Upper Stage (EUS) (MAF 20210209 EUS testpanels 001)

EUS panel test weld at the VXC in Building 115 at the Michoud Assembly Facility on Tuesday, February 9, 2021.

EUS panel test weld at the VXC in Building 115 at the Michoud Assembly Facility on Tuesday, February 9, 2021.

Manufacturing and testing the first in a series of initial weld confidence articles for the Exploration Upper Stage (EUS (MAF 20210209 EUS testpanels 006)

EUS panel test weld at the VXC in Building 115 at the Michoud Assembly Facility on Tuesday, February 9, 2021.

Exploration Upper Stage (EUS) for future flights of NASA’s Space Launch System (SLS) rocket (MAF 20210209 EUS testpanels 008)

Type	Subtype	Date	Description	Notes	Source
commons	image		SLS EUS 2017		Commons
commons	image		SLS EUS 2017		Commons
commons	image		Exploration Upper Stage 2019		Commons
commons	image		EUS VS SIVB		Commons
commons	image		Manufacturing and testing the first in a series of initial weld confidence articles for the Exploration Upper Stage (EUS) (MAF 20210209 EUS testpanels 001)		Commons
commons	image		EUS panel test weld at the VXC in Building 115 at the Michoud Assembly Facility on Tuesday, February 9, 2021.		Commons
commons	image		EUS panel test weld at the VXC in Building 115 at the Michoud Assembly Facility on Tuesday, February 9, 2021.		Commons
commons	image		Manufacturing and testing the first in a series of initial weld confidence articles for the Exploration Upper Stage (EUS (MAF 20210209 EUS testpanels 006)		Commons
commons	image		EUS panel test weld at the VXC in Building 115 at the Michoud Assembly Facility on Tuesday, February 9, 2021.		Commons
commons	image		Exploration Upper Stage (EUS) for future flights of NASA’s Space Launch System (SLS) rocket (MAF 20210209 EUS testpanels 008)		Commons