by Tracy McMahan for MSFC News As teams continue to prepare NASA's Space Launch System (SLS) rocket for its debut flight with the launch of Artemis I, NASA and its partners across the country have made great progress building the rocket for Artemis II, the first crewed Artemis mission. The team is also manufacturing and testing major parts for Artemis missions III, IV and V.

"The Space Launch System team is not just building one rocket but manufacturing several rockets for exploration missions and future SLS flights beyond the initial Artemis launch," said John Honeycutt, SLS program manager at NASA's Marshall Space Flight Center in Huntsville, Alabama. "The Artemis I mission is the first in a series of increasingly complex missions that will extend our presence on the Moon. The SLS rocket's unprecedented power and capabilities will send missions farther and faster throughout the solar system."

With its two solid rocket boosters and four RS-25 engines, SLS produces more than 8.8 million pounds of thrust to launch each Artemis mission beyond Earth's orbit and onward to the Moon. The rocket features some of the largest, most advanced, and most reliable hardware elements ever built for space exploration.

To power the agency's next-generation deep space missions, SLS delivers propulsion in phases. At liftoff, the core stage with its four RS-25 engines and the twin boosters fire to propel SLS off the launch pad into orbit. Once in orbit, the Interim Cryogenic Propulsion Stage (ICPS) provides the in-space propulsion to send NASA's Orion spacecraft and its crew on a precise trajectory toward the Moon.

The first piece of rocket hardware - the ICPS - for Artemis II arrived in Florida July 28, 2021. It is undergoing final preparations at lead contractors Boeing and United Launch Alliance's (ULA) facilities and will soon be delivered nearby to NASA's Kennedy Space Center. The ICPS fires its RL10 engine, provided by Aerojet Rocketdyne, to send the Orion spacecraft toward the Moon. ULA is already building the Artemis III ICPS in its factory in Decatur, Alabama.

"The Space Launch System is a highly capable launch vehicle purposely designed and rigorously tested to safely transport people, large cargo, and flagship science missions to deep space destinations," said John Blevins, SLS chief engineer at Marshall. "From the beginning, the SLS rocket was built to first safely send astronauts to space, and at the same time, to evolve to an even more powerful configuration that can support a variety of missions."

Every NASA center and more than 1,000 different companies across America helped build the Artemis I SLS rocket as well as the SLS rockets that will launch future missions. The boosters and RS-25 engines - the main propulsion elements of the rocket - for the Artemis II and Artemis III missions are in the final stages of assembly. In Utah, crews with Northrop Grumman, the lead contractor for the boosters, have completed casting all the booster motor segments for both Artemis II and Artemis III and began casting segments for Artemis IV. The five-segment solid rocket booster is the largest and most powerful booster ever built for spaceflight.

Aerojet Rocketdyne, the RS-25 lead contractor, is readying the RS-25 engines for the next three SLS flights after Artemis I. The engines have been tested and will be integrated with their respective core stages closer to final assembly. The engines for Artemis II are ready to go to NASA's Michoud Assembly Facility in New Orleans, where they'll be integrated with the SLS core stage. The Artemis III engines are being prepared for flight at Aerojet Rocketdyne's facility at NASA's Stennis Space Center near Bay St. Louis, Mississippi, and the company is already manufacturing engines for missions beyond Artemis IV.

Each 212-foot-tall core stage is produced by Boeing at Michoud. The factory's 2.2-million-square-feet of manufacturing space and its cutting-edge manufacturing equipment allow teams to build multiple rocket stages at once. Currently, NASA and Boeing, the lead contractor for the SLS core stage, are building core stages for Artemis II, Artemis III, and Artemis IV at Michoud. In addition to the core stage, manufacturing at Michoud has started on test articles for the Exploration Upper Stage (EUS) that will power the Block IB configuration of the rocket starting with the Artemis IV mission.

"New tooling has been installed at Michoud to build the Exploration Upper Stage at the same time core stages are produced," said Steve Wofford, NASA's manager for the SLS Block IB effort. The EUS will send 83,000 pounds to the Moon, which is 40 percent more payload to orbit than the ICPS used on early Artemis missions, and 70 percent more than any existing rocket."

Crews from Teledyne Brown Engineering in Huntsville, Alabama, and Marshall are manufacturing the cone-shaped launch vehicle stage adapters and Orion stage adapters for Artemis II and Artemis III. The adapters serve as vital connection points for the core and ICPS and Orion spacecraft. For missions beyond Artemis III, the universal stage adapter will connect the EUS to the Orion spacecraft and act as a payload storage compartment, accommodating large payloads, such as logistics modules or other exploration spacecraft. Engineers at RUAG Space USA completed panels for a universal stage adapter test article and delivered the panels to Dynetics in Huntsville, Alabama, the lead contractor for the adapter, that is assembling the test article in preparation for tests later in 2022.

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