NASA simply picked a brand new higher stage for its SLS moon rocket amid Artemis shakeup

NASA’s revised plans to ship astronauts again to the moon are shortly taking form.

On Feb. 27, NASA Administrator Jared Isaacman revealed a brand new imaginative and prescient for the Artemis program, and the missions the company hopes will set up a long-term human presence on the lunar floor. The shuffle contains up to date mission targets for Artemis 3 and past, a shorter cadence between launches of the House Launch System (SLS) rocket, and an SLS redesign that’s now coming into focus.

Beneath the earlier program structure, the SLS “Block 1” variant, which used the Interim Cryogenic Propulsion Stage (ICPS) as its higher stage, would launch Artemis 1 through Artemis 3, while Artemis 4 and beyond would fly with SLS Block 1B and Block 2, which featured the more powerful Exploration Upper Stage (EUS). Now, however, NASA is scrapping those upgrades for a “standardized” SLS configuration.

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At the time of the Feb. 27 announcement, NASA did not indicate what the standardized SLS version would look like, or what its vision was for the SLS upper stage. But a concurrent image release illustrating the new Artemis framework showed the program’s Orion crew capsule flying on a vehicle that was unmistakably neither the ICPS or EUS.

Instead, Orion and its service module were pictured burning under the power of what appears to be a Centaur V — the upper stage for United Launch Alliance’s (ULA) new Vulcan rocket.

This fueled speculation at the time, which was confirmed on March 6, when the government’s System for Award Management (SAM.gov) web site listed the “Vulcan Centaur V Higher Stage for House Launch System” contract alternative.

The chance originated from NASA’s Marshall House Flight Heart in Alabama, and was described as “a sole supply contract” for ULA to provide “next-generation higher phases to be used in House Launch System (SLS) Artemis IV and Artemis V.”

“No Different Provides or Providers Will Fulfill Company Necessities as a result of extremely specialised nature of this requirement,” company officers added within the SAM.gov posting.

Centaur V has a confirmed flight report on Vulcan, which debuted in 2024 and has 4 profitable launches underneath its belt (with a notable few points, unrelated to Centaur). Its predecessors, Centaurs III and IV, flew utilizing the identical RL10 engine and relied on a lot of the identical expertise constructed into Centaur V to meet almost 170 launches aboard ULA’s Delta IV and Atlas rockets.

a rocket launches on the left while many spacecraft occupy the lunar surface and space on the right.

NASA Artemis program define after restructure. (Picture credit score: NASA)

Moreover, a variant just like Centaur, the Delta Cryogenic Second Stage, supported Orion on the spacecraft’s Exploration Flight Take a look at-1 in December 2014, when a ULA Delta Heavy launched the capsule into area for the primary time. That mission despatched an uncrewed Orion to Earth orbit and again.

Centaur V is powered by two RL10 engines and is the most important, most superior of the ULA Centaur line. It holds about twice as a lot gasoline because the ICPS and is sort of the identical diameter as Orion and its service module.

“ULA’s Centaur (with minor modifications) is the one current in-space propulsion stage able to assembly the SLS higher stage design parameters and efficiency traits, whereas additionally assembly NASA’s schedule,” NASA mentioned in a submitted document justifying awarding the contract to ULA with out competitors.

That schedule was additionally a part of the shift in Artemis’ structure. Artemis 2, which is on monitor for a potential launch try as early as April 1, stays unchanged. Every mission after that, nevertheless, has been repurposed and accelerated.

Artemis 2 will launch a crew of 4 astronauts on a 10-day mission to fly a single loop round the moon and again to Earth. Artemis 3 was initially designed as this system’s first lunar touchdown, focused for 2028, however has been reworked right into a 2027 check flight with Orion and a number of Artemis lunar landers in low Earth orbit. (Each SpaceX’s Starship and Blue Origin‘s Blue Moon landers have been chosen underneath Artemis’ Human Touchdown Providers contract, and NASA has indicated that Artemis 3 will make the most of both or each, relying on their readiness.)

Artemis 4 is now the primary mission within the lineup with the target of touchdown astronauts on the lunar floor, which NASA nonetheless hopes to perform in 2028, with a follow-up touchdown on Artemis 5 probably occurring that very same yr.

With the Artemis 2 SLS stacked and almost prepared for launch, and the Artemis 3 SLS already outfitted to accommodate ICPS, Artemis 4 and 5 are solely the 2 missions confirmed to launch Orion with the standardized SLS configuration and Centaur V higher stage, in line with NASA’s contract specs. which do not point out any missions past Artemis 5.

What is going to carry Orion to orbit past Artemis 5 could also be mere hypothesis at this level. The SLS has skilled quite a few delays and value overruns throughout its lengthy improvement, spurring criticism from many who view its continued funding as extra of a jobs program fueled by the U.S. Senate than as a sustainable area program. And a few within the area business are asking concerning the viability of SpaceX‘s Tremendous Heavy booster — the primary stage of the Starship megarocket, which stays in improvement — to assist Orion launches, or probably even Starship stepping in as Artemis’ crew transport car for Artemis 6 and past.