European Service Module
ESA-built propulsion and life-support module powering Orion on Artemis II.
Last refreshed: 2 April 2026 · Appears in 1 active topic
How does Europe's service module give ESA leverage in the Artemis programme?
Latest on European Service Module
- What is the European Service Module?
- The ESM is an ESA-built module that provides propulsion, power, water, and oxygen to NASA's Orion capsule. ESM-2 is flying on Artemis II, built by Airbus in Bremen.Source: ESA/NASA programme documentation
- Which countries built the European Service Module?
- Airbus Defence and Space assembled ESM-2 in Bremen, Germany, with components from 13 ESA member states.Source: ESA press release, April 2026
- Why does Orion need a European service module?
- The ESM provides the propulsion needed to insert Orion into a translunar trajectory and return it to Earth. Without it, Orion's crew module has no main engine.Source: NASA/ESA technical documentation
- What engine does the European Service Module use?
- ESM-2 uses a main engine derived from the Ariane 5 upper stage, with heritage from Europe's Hermes shuttle programme. It produces 24 kilonewtons of thrust.Source: Airbus/ESA technical specifications
Background
The European Service Module (ESM-2) is providing propulsion, power, thermal control, and life support to Orion on the Artemis II mission, launched 1 April 2026. ESA confirmed on 2 April that the module is powering the vehicle correctly ahead of the critical translunar injection burn.
Built by Airbus Defence and Space in Bremen, ESM-2 incorporates components from 13 ESA member states, including the main engine from the Ariane 5 upper stage (a heritage from Europe's Hermes shuttle programme). It provides 24 kilonewtons of thrust from its main engine, augmented by 8 auxiliary and 24 attitude control thrusters. The module carries 9 tonnes of propellant at launch and supplies oxygen and water through the lunar transit and return. ESM-1 flew on Artemis I; ESM-3 is in production for Artemis III.
ESM represents the most significant European hardware contribution to a US crewed spaceflight programme since the Columbus laboratory on the ISS. It gives ESA industrial leverage in the Artemis architecture: without the service module, Orion cannot fly. That leverage will be central to ESA's negotiations over post-Gateway participation in lunar exploration, particularly as the international cooperation framework for Artemis evolves.
