The fourth European Service Module (ESM-4), a cornerstone of NASA’s Orion spacecraft, has departed Airbus facilities in Bremen, Germany, for NASA’s Kennedy Space Center. Upon arrival, it will undergo testing and integration with the Orion Crew Module, advancing preparations for the Artemis IV mission.
Constructed by Airbus for the European Space Agency (ESA), ESM-4 is critical for Artemis IV, which aims to deliver astronauts to the lunar Gateway station. This mission will see crews living and working aboard Gateway, a vital stepping stone for future scientific discovery and human exploration toward Mars.
“ESM-4’s delivery signifies a major step toward a new era of sustained lunar exploration and deep space research,” said Ralf Zimmermann of Airbus. Daniel Neuenschwander of ESA added, “It underscores Europe’s pivotal role in this global endeavor, particularly as Artemis IV is set to deliver the International Habitation Module (I-Hab) for Gateway.”
The cylindrical ESM, positioned directly below the crew capsule, is the spacecraft’s powerhouse and life-support backbone. It provides propulsion, electrical power via four solar arrays, thermal control, and essential water and oxygen for the crew. Thales Alenia Space Italia supplies the thermal system that meticulously maintains the crew cabin at a stable, habitable temperature.
The service module’s four solar wings generate substantial power—approximately 11.2 kW, sufficient for two Earth households. Notably, only 10% powers the ESM itself, with the remaining 90% dedicated to the crew module’s systems and batteries. These batteries are crucial, ensuring continuous power during eclipses and for a safe return journey after the ESM is jettisoned prior to Earth re-entry.
Orion’s propulsion is anchored by 33 engines on the ESM. The primary engine, a repurposed Space Shuttle engine, provides the powerful thrust needed to break free of Earth’s gravity and journey toward the Moon. A suite of smaller engines handles precise maneuvering, orbital corrections, and attitude control for complex operations like docking with the Gateway.
With advanced, autonomous electronics managing routine functions, the ESM allows astronauts to focus on mission-critical tasks as humanity prepares to return to the Moon and beyond
