NASA Selects ULA’s Centaur 5 as New Upper Stage for Space Launch System Rocket

Summary (TL;DR)

NASA has chosen United Launch Alliance’s (ULA) Centaur 5 upper stage to be used in its Space Launch System (SLS) rocket, starting with the Artemis 4 mission scheduled for early 2028. This decision marks a significant change in NASA’s plans for the SLS rocket, which was originally designed with a different upper stage in mind.

March 7, 2026Hype Rating: 60/100

NASA Blue Origin ULA

Commercial Space Industry

In a notable development for the US space program, NASA has officially selected United Launch Alliance’s (ULA) Centaur 5 upper stage to be used in its Space Launch System (SLS) rocket. The Centaur 5 will make its debut with the SLS rocket on the Artemis 4 mission, which is currently scheduled to launch in early 2028.

The Centaur 5 was developed by ULA as the upper stage for its Vulcan rocket, which is designed to be a highly efficient and cost-effective launch vehicle. The Centaur 5 uses liquid oxygen and liquid hydrogen as its propulsion type, which provides a high level of specific impulse and enables the rocket to achieve high speeds and altitudes.

It’s worth noting that ULA has experience with human-rated upper stages, as its Centaur 3 upper stage was certified to launch humans as part of NASA’s Commercial Crew Program. This certification process involved rigorous testing and validation to ensure the upper stage could safely carry crew members to orbit.

NASA’s decision to use the Centaur 5 upper stage on the SLS rocket marks a significant change in plans for the agency. Originally, the SLS rocket was designed to use a different upper stage, known as the Exploration Upper Stage (EUS). However, due to cost and schedule overruns, NASA decided to move away from the original plan and instead opted for the Centaur 5. This decision is expected to save time and money, while also providing a more efficient and capable upper stage for the SLS rocket.

The selection of the Centaur 5 upper stage has major implications for the broader aerospace industry. The use of a commercial upper stage on a NASA launch vehicle demonstrates the agency’s willingness to leverage private sector innovation and expertise to achieve its goals. This approach can help reduce costs, improve efficiency, and increase the overall capabilities of NASA’s launch vehicles.

Furthermore, the Centaur 5 upper stage is designed to be compatible with multiple launch vehicles, including ULA’s Vulcan rocket and potentially other rockets in the future. This compatibility could enable greater flexibility and interoperability between different launch systems, which could be beneficial for a range of space missions and applications.

In conclusion, NASA’s selection of the Centaur 5 upper stage for the SLS rocket is a significant development that reflects the agency’s commitment to innovation, efficiency, and cost-effectiveness. As the US space program continues to evolve and expand, the use of commercial upper stages like the Centaur 5 is likely to play an increasingly important role in enabling NASA’s missions and achieving its goals in space exploration.

Why It Matters

The selection of United Launch Alliance's (ULA) Centaur 5 upper stage for NASA's Space Launch System (SLS) rocket marks a crucial milestone in the development of the agency's heavy-lift launch vehicle. This decision has significant implications for long-term human exploration, particularly in the context of NASA's Artemis program aimed at returning humans to the lunar surface by 2024 and establishing a sustainable presence on the Moon. The Centaur 5 upper stage offers enhanced performance and payload capacity, which will be essential for sending crewed missions to the Moon and eventually to Mars. By adopting this new upper stage, NASA can ensure that the SLS rocket meets the demanding requirements of deep space missions, including the need for precise trajectory control and sufficient propulsion to escape Earth's gravitational pull.

From a technological standpoint, the integration of the Centaur 5 upper stage into the SLS rocket represents a notable advancement in spacecraft propulsion systems. The Centaur 5 is designed to provide higher thrust and more efficient fuel management compared to its predecessors, which will enable NASA to launch more massive payloads into deep space. This development has significant implications for the advancement of reusability technology, as the Centaur 5's improved performance could potentially pave the way for future reusable upper stages. Furthermore, the selection of the Centaur 5 demonstrates the importance of industry collaboration and technology transfer in advancing space exploration capabilities. As NASA continues to push the boundaries of space travel, the incorporation of cutting-edge propulsion systems like the Centaur 5 will play a vital role in enabling more efficient and sustainable mission architectures.

The economic and commercial implications of this development should not be overlooked. The selection of ULA's Centaur 5 upper stage is likely to have a positive impact on the US launch industry, as it reinforces the company's position as a leading provider of heavy-lift launch services. Moreover, the adoption of the Centaur 5 could lead to increased competition in the commercial launch market, driving innovation and reducing costs for satellite operators and other space-faring organizations. As NASA's Artemis program gains momentum, the demand for reliable and efficient launch services is expected to grow, creating new opportunities for commercial launch providers like ULA to support both government and private sector missions.

In terms of mission architecture and infrastructure, the integration of the Centaur 5 upper stage into the SLS rocket will require significant updates to NASA's existing launch and ground systems. The agency will need to modify its launch pads, fueling systems, and other supporting infrastructure to accommodate the new upper stage. This effort will likely involve collaboration with industry partners and will have a lasting impact on the development of future space missions. As NASA continues to invest in the SLS rocket and the Artemis program, the selection of the Centaur 5 upper stage represents an important step towards establishing a sustainable and flexible launch capability that can support a wide range of deep space missions.

The geopolitical implications of this development are also worth considering. The selection of ULA's Centaur 5 upper stage reinforces the United States' position as a leader in space exploration and development, demonstrating its commitment to advancing human presence in space. As international cooperation and competition in space continue to evolve, NASA's investment in the SLS rocket and the Artemis program sends a strong signal about the country's intentions to maintain a prominent role in shaping the future of space exploration. Furthermore, the adoption of the Centaur 5 upper stage could have implications for future international collaborations, as NASA may seek to leverage its advanced launch capabilities to support joint missions with partner agencies like the European Space Agency or the Canadian Space Agency.

Long-term Outlook

Long-term Outlook

The selection of ULA's Centaur 5 as the new upper stage for the Space Launch System (SLS) rocket marks a significant milestone in the development of NASA's heavy-lift launch vehicle. With the Artemis 4 mission scheduled for early 2028, the next few years will be crucial in integrating the Centaur 5 with the SLS rocket and ensuring a successful maiden flight. The upcoming milestones include the completion of the Centaur 5 design, fabrication, and testing, followed by its integration with the SLS core stage. NASA and ULA will also need to conduct a series of ground tests and simulations to validate the performance of the new upper stage.

While the selection of the Centaur 5 is a positive step forward, there are potential delays or dependencies that could impact the timeline. One of the main challenges will be ensuring that the Centaur 5 meets the stringent performance requirements of the SLS rocket, particularly in terms of payload capacity and precision navigation. Additionally, the integration of the new upper stage with the existing SLS infrastructure may require significant modifications, which could lead to delays or cost overruns. Historical context suggests that such integrations can be complex and time-consuming, as seen in similar programs like the Space Shuttle main engine development. Furthermore, the Artemis program's ambitious goals, including establishing a sustainable presence on the lunar surface, will require careful planning and execution to ensure success.

From a technical perspective, the Centaur 5 upper stage is a well-established design with a proven track record, which reduces some of the technical risks associated with its development. However, the scaling up of the Centaur 5 to meet the SLS rocket's performance requirements may still pose some challenges, particularly in terms of materials, manufacturing, and testing. Aerospace engineering constraints, such as the need for high-specific-impulse engines and advanced thermal protection systems, will also need to be carefully managed to ensure the success of the mission. Realistic expectations based on historical patterns suggest that the development and integration of the Centaur 5 upper stage will take time, effort, and resources, but with careful planning and execution, it is possible to achieve a successful outcome.

Looking ahead, the next few years will be critical in determining the long-term success of the SLS rocket and the Artemis program. While there are uncertainties and potential challenges associated with the development and integration of the Centaur 5 upper stage, NASA and ULA have a

Space Hype Rating: 60/100

Notable progress with meaningful contributions to space exploration

NASA Selects ULA’s Centaur 5 as New Upper Stage for Space Launch System Rocket

Summary (TL;DR)

Why It Matters

Long-term Outlook

Space Hype Rating: 60/100

Related Articles

Eutelsat Completes €5 Billion Refinancing Plan to Support Low Earth Orbit Constellation and European Connectivity Program

The Space Ecosystem’s Shift Towards Hyperscalers: Power Efficiency Becomes Key Differentiator

NASA Revamps Artemis Program to Expedite Lunar Missions

Related Articles

Eutelsat Completes €5 Billion Refinancing Plan to Support Low Earth Orbit Constellation and European Connectivity Program
Eutelsat has successfully completed a €5 billion refinancing plan, which will be used to refresh its OneWeb low Earth orbit broadband constellation and support Europe's IRIS² sovereign connectivity program. This move is expected to have significant implications for the aerospace industry, particularly in the development of low Earth orbit connectivity technologies.
about 13 hours ago55/100

The Space Ecosystem’s Shift Towards Hyperscalers: Power Efficiency Becomes Key Differentiator
The space industry is undergoing a significant transformation with the emergence of hyperscalers, large cloud and network providers, and the increasing importance of power efficiency in satellite technology. As companies like SpaceX achieve notable advancements in power-per-mass efficiency, the sector is poised for further innovation and competition.
about 13 hours ago60/100

NASA Revamps Artemis Program to Expedite Lunar Missions
NASA has announced a significant overhaul of its Artemis program, aiming to accelerate the pace of its lunar missions by shortening the time between launches to 10 months. This revamped approach will involve key changes to the program's hardware and mission schedule.
about 13 hours ago60/100