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Article: Ding-dong! The Exploration Upper Stage is dead

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5 / 10

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NASA has canceled the development of the Exploration Upper Stage for its SLS rocket, opting instead to procure next-generation upper stages from United Launch Alliance for future Artemis missions. The stage, long criticized as an example of political pork-barrel spending, was rendered obsolete by newer, more capable commercial rockets from companies like SpaceX and Blue Origin. Its cancellation marks the end of a program sustained primarily by political support rather than technical necessity.

The main topics covered are the cancellation of NASA's Exploration Upper Stage, its history as a politically motivated project, and the shift to commercial alternatives for the Space Launch System.

Original URL

https://arstechnica.com/space/2026/03/ding-dong-the-exploration-upper-stage-is-dead/

Source Feed

Ars Technica

Published Date

2026-03-06 23:40

Fetched Date

2026-03-06 21:30

Processed Date

2026-03-06 21:31

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Present

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In his 1961 novel The Winter of Our Discontent, John Steinbeck wrote of loss, “It’s so much darker when a light goes out than it would have been if it had never shone.”
The death of NASA’s Exploration Upper Stage today represents the inverse of that sentiment. The world of spaceflight is so much brighter now that its light has gone out.
The rocket’s death came via a seemingly pedestrian notice posted on a government procurement website: “NASA/MSFC intends to issue a sole source contract to acquire next-generation upper stages for use in Space Launch System (SLS) Artemis IV and Artemis V from United Launch Alliance (ULA).”
If the Exploration Upper Stage was anything, it was a survivor—a testament to the power of pork, and the value of political support from key southern senators in Alabama, Mississippi, Texas, and Florida.
Why it came into existence
Contracted to Boeing more than a decade ago, the Exploration Upper Stage upgrade was intended to allow the SLS rocket to launch not just the Orion spacecraft to the Moon, but large payloads alongside it. That the development of capable rockets by SpaceX, Blue Origin, and United Launch Alliance to deliver large cargo to the Moon rendered it obsolete mattered, for a long time, not at all.
So why have the Exploration Upper Stage at all?
The short answer is, mostly, pork (excess spending). But let’s unpack it a little further. When Congress and NASA created the SLS rocket in 2011, they always intended the first launch or two to use an “interim” upper stage, essentially a modified version of the Delta IV rocket’s upper stage. But that rocket faced retirement (it was too expensive in the face of emerging competition), so NASA needed a more permanent upper stage.