x.com/ThePrimalDino/status/2027414769372676410
1 correction found
Gateway still isnt canceled, which means EUS is required to exist so long as that program exists.
NASA’s Gateway program is not dependent on the SLS Exploration Upper Stage (EUS): Gateway’s foundational elements are planned to launch on SpaceX’s Falcon Heavy, and NASA describes Gateway as involving multiple launches on different vehicles.
Full reasoning
Why this is incorrect
The post claims that because Gateway is not canceled, EUS is “required to exist” as long as Gateway exists. That’s too strong and contradicts NASA’s own program descriptions.
NASA has explicitly stated that Gateway’s foundational elements (PPE and HALO) are contracted to launch on a SpaceX Falcon Heavy rocket, not on SLS and not with EUS. This directly shows Gateway can (and is planned to) proceed without EUS.
Additionally, NASA’s description of Artemis IV emphasizes “multiple launches and spacecraft dockings” as part of the mission architecture, again indicating Gateway is not singularly dependent on SLS Block 1B/EUS existing.
EUS is an upgrade for SLS Block 1B that enables certain SLS mission capabilities (e.g., co-manifesting large payloads such as the Gateway I-Hab module alongside Orion), but that is different from Gateway being “required” to have EUS to exist at all.
Key contradictory evidence from NASA
- NASA states PPE+HALO (foundational Gateway elements) are to launch on Falcon Heavy.
- NASA describes Gateway/Artemis IV as an “intricate choreography of multiple launches”, which is inconsistent with the idea that the Gateway program’s existence requires a specific SLS upper stage.
Because NASA’s official program info shows Gateway elements launching on non-SLS rockets and being built via multiple launches, the claim that Gateway’s existence requires EUS is contradicted by hard evidence.
3 sources
- NASA Awards Contract to Launch Initial Elements for Lunar Outpost - NASA
“NASA has selected ... SpaceX ... to provide launch services for ... the foundational elements of the Gateway ... targeted to launch together ... on a Falcon Heavy rocket ...”
- NASA’s Artemis IV: Building First Lunar Space Station - NASA
“The mission will bring together an intricate choreography of multiple launches and spacecraft dockings in lunar orbit ... engineers will connect its first two modules ... for launch aboard a SpaceX Falcon Heavy rocket.”
- SLS (Space Launch System) Block 1B - NASA
“Two major upgrades distinguish the SLS Block 1B crew...: the new exploration upper stage (EUS) ... The first Block 1B co-manifested payload will be the Lunar I-Hab for Gateway ...”