How Europe will power the journey to the Moon and back: the European module at the heart of the Artemis II mission
The Artemis II mission is expected to become one of the most important stages of humanity’s new return toward the Moon, but also a test of how truly capable the United States and Europe are of jointly leading complex flights into deep space. While public attention is understandably focused most on the four-member crew and on the very fact that humans will circle the Moon again for the first time in more than half a century, at the technical heart of the entire undertaking lies a less visible but decisive European element: the European Service Module, that is, the European service module of the Orion spacecraft.
According to NASA and the European Space Agency, that module provides the three key things without which the mission cannot succeed: propulsion, electrical power, and life-support systems. Put simply, the Orion capsule is the space in which astronauts sit, work, and travel, but the European service module is the “engine room” that enables the entire system to reach the Moon, carry out the required maneuvers, and safely return the crew to Earth. At a moment when the question is reopening of who will technologically and industrially carry the new era of lunar exploration, Artemis II shows that the answer is no longer exclusively American.
A mission that must confirm that humanity’s return toward the Moon is sustainable
Artemis II is the first crewed mission of the Artemis program. After the uncrewed Artemis I mission, which in 2022 checked how Orion and its European service module function in flight around the Moon and on the return toward Earth, the goal now is to validate that same system in real flight conditions with astronauts on board. NASA states that this is an approximately ten-day mission, designed as a comprehensive test of key systems before later attempts to land humans on the surface of the Moon.
As of March 28, 2026, the official NASA and ESA pages list Artemis II as a mission planned for April 2026, while U.S. media, citing NASA preparations in Florida, reported that the earliest launch opportunity is the beginning of April. This means that the project, after years of technical checks, delays, and integration work, is in the final phase of preparation. Still, as with every complex space mission, the final date always remains subject to weather conditions, technical checks, and the condition of the rocket system on the launch pad.
The crew consists of NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, as well as Canadian astronaut Jeremy Hansen. The mission also has a strong symbolic dimension: NASA emphasizes that Glover will become the first Black astronaut to fly toward the Moon, Koch the first woman on such a mission, and Hansen the first Canadian to take part in a flight around the Moon. But the symbolism here is not an end in itself. Artemis II must show that deep space can once again be reached routinely and that the systems on which the entire program rests are reliable enough for even more ambitious steps.
What exactly the European service module does
The European service module is not just one of Orion’s subsystems, but its energetic and propulsion foundation. ESA describes it as the spacecraft’s “powerhouse,” that is, the part that delivers what, without it, leaves the astronauts’ cabin as merely a passive capsule. The module provides the crew with air, water, and temperature control, while at the same time generating electrical power and carrying out the maneuvers required for flight in deep space.
For Artemis II, the second such module is being used, known as ESM-2. According to ESA data, its launch mass is about 13.5 tons, a large part of which is fuel. It also contains drinking water and supplies of oxygen and nitrogen, necessary for maintaining conditions suitable for the crew’s stay. NASA and ESA especially emphasize that this is a system that must operate without serious error because, after departure toward the Moon, the crew can no longer rely on rapid assistance from low Earth orbit, as is the case with flights to the International Space Station.
The module gets electrical power from four large solar wings. ESA states that these solar arrays supply Orion with power throughout the entire flight, while the cooling and thermal systems maintain stable conditions for equipment operation and astronaut habitation. In a mission such as Artemis II, this is not a secondary function. Moving away from Earth means entering completely different thermal, radiation, and operational conditions from those near the planet, so the stability of the service module is just as important as the rocket that launches it.
The engine that pushes Orion toward the Moon
One of the lesser-known but flight-critical facts is that it is precisely the European service module that will perform the key propulsion tasks after Orion is separated from the rocket’s upper stage. ESA states that the ESM has a total of 33 engines for different purposes. The main engine is responsible for larger velocity changes, that is, for the burns that direct the spacecraft toward the Moon and later help on the return. Alongside it operate auxiliary engines and smaller thrusters for orientation, stabilization, and fine control of the spacecraft’s attitude.
That is an important difference from the way the public often imagines a flight to the Moon. It is not enough simply to “be launched” by a powerful rocket. After leaving Earth’s immediate environment, the spacecraft must precisely perform maneuvers and maintain an exact trajectory. According to NASA visualizations and the technical description of the flight, Artemis II will use a so-called free-return trajectory, that is, a path that uses the gravitational relationship of Earth and the Moon so that after circling the Moon it naturally directs Orion back toward Earth. That is precisely why propulsion precision and the reliability of the service module are critical: an error in a maneuver does not mean only a deviation from the plan, but potentially jeopardizing the entire return.
ESA had previously stated in technical presentations that during the mission the crew would fly thousands of kilometers beyond the Moon before beginning the return toward Earth. In current mission descriptions, NASA emphasizes that it will be a flight around the Moon and a return on a free-return trajectory, with the possibility of minor adjustments to the actual route depending on the final launch moment. In other words, this is not a symbolic loop around Earth’s satellite, but a real operational test of navigation, power, communication, and propulsion in deep space.
European industry behind the module
Although political and media discussions often speak of the “European contribution,” behind that term stands a very concrete industrial network. ESA states that the prime contractor is Airbus Defence and Space in Bremen, while key parts and subsystems arrived from more than 20 companies in more than 10 European countries. The structure of the module is linked to Italian industry, the solar wings to the Dutch Airbus segment, and many other parts come from different European supply chains.
Such a distribution of work is important for at least two reasons. The first is technological: Europe is therefore not participating at the level of symbolic support, but is delivering a system without which Orion cannot carry out the mission. The second is political-economic: space programs of this scale strengthen domestic industrial capacities, retain highly qualified jobs, and ensure continuity of knowledge in sectors that later spill over into other areas of high technology. Artemis II is therefore not just a story about astronauts and flags, but also about who in practice possesses the competencies for complex manufacturing in the European space sector.
Why the European role is greater than it appears at first glance
The European service module for Artemis II is not a one-off gesture, but part of a broader political and programmatic agreement between ESA and NASA. As part of the agreement on Europe’s participation in the Gateway program and the broader Artemis program, Europe took on the obligation to deliver service modules for Orion, and in return secured future opportunities for European astronauts in lunar missions and in work on the future Gateway station in orbit around the Moon.
That places Artemis II in a different context. It is not only about Europe “helping” an American mission, but about the fact that European industry and institutions are being built into the very architecture of future missions toward the Moon. ESA had already previously confirmed the continuation of production of the next service modules for later missions, and work on the modules for Artemis III and Artemis IV shows that the cooperation does not stop with one flight. In that sense, the service module for Artemis II can be viewed as concrete proof that Europe is no longer a side partner in lunar exploration, but one of the load-bearing pillars of the program.
Why Artemis II is important even beyond the space community
If the mission succeeds according to plan, Artemis II will be the first human flight around the Moon since the Apollo program and the first such undertaking in an era in which space policy is conducted in a significantly different geopolitical environment. Today, space programs are no longer determined only by superpower prestige, but also by the question of industrial independence, international partnerships, the development of critical technologies, and long-term access to resources and infrastructure in space.
That is precisely why the European service module also has a broader meaning. It shows that Europe, although it does not have its own super-heavy rocket for a crewed flight toward the Moon, possesses the knowledge and industrial base to build the part of the system without which such a mission cannot function. That is a political and technological argument that is not negligible in European debates on strategic autonomy. When a European module delivers air, water, electricity, and propulsion for a flight around the Moon, then Europe is no longer just a market or a partner in science, but a producer of critical space infrastructure.
For the wider public, this is at the same time a reminder that modern space exploration is rarely reduced to one nation and one flag. The Artemis program is conceived as an international architecture, and Artemis II is one of the missions on which that idea is seen for the first time in full operational form. The crew is American-Canadian, the key service system European, and future ambitions are linked to an even broader international framework.
What follows after this flight
NASA describes Artemis II as the step that must confirm that the SLS rocket, the Orion spacecraft, and all key systems are capable of safely carrying people to deep space and back. If that goal is achieved, the next major stage is Artemis III, the mission that should open the way to a new landing of astronauts on the Moon. At that stage, the importance of European technology does not disappear, but continues through new service modules and through European participation in the development of the lunar Gateway station.
In other words, Artemis II is not just a test flight. It is a decisive test of the architecture on which the entire next phase of lunar exploration rests. In the public space, the moment of launch and images of the astronauts will attract the most attention, but the real test will take place in the systems that operate quietly and far from the cameras: in the tanks, pipes, solar wings, cooling loops, and engines of the European service module. If Orion safely circles the Moon and returns the crew home, part of the answer to the question of how that will be possible is already known — a large part of that journey will be carried by Europe.
Sources:- NASA – official Artemis II mission page with a description of the goals, duration, and crew (link)- NASA – press kit with a description of the free-return trajectory and the phases of the mission around the Moon (link)- NASA – visualization of the nominal trajectory of the Artemis II mission and explanation of the free-return trajectory (link)- ESA – official Artemis II page with technical data on the European service module, mission duration, and the planned launch in April 2026 (link)- ESA – article on the handover of European Service Module-2 for Artemis II, with data on the module’s role and flight profile (link)- NASA – overview of the European service module as a key part of Orion (link)- ESA Orion Blog – overview of the journey of the ESM-2 module from contracting to the Artemis II mission, published on March 25, 2026 (link)- ESA – FAQ on the Gateway and Artemis agreement, with an explanation of the European contribution and future flights (link)- Associated Press – report from March 28, 2026 on the crew’s arrival at Kennedy Space Center and the current launch window in early April (link)
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