Orion European Service Module
Science & Exploration

European Service Module

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ESA / Science & Exploration / Human and Robotic Exploration / Orion

The European Service Module is ESA’s contribution to NASA’s Orion spacecraft that will send astronauts to the Moon and beyond. It provides electricity, water, oxygen and nitrogen as well as keeping the spacecraft at the right temperature and on course.

Orion European Service Module test article
Orion European Service Module test article

The cylindrical module is unpressurised and 4 m long, including the main engine and tanks for gas and propellant. During launch it is held in place by the Spacecraft Adapter and is connected to the capsule where the astronauts are by the Crew Module Adapter.

The main body of the service module is around 2 m high but its main engine, the Orbital Maneuvering System Engine, extends into the Spacecraft Adapter. Likewise, some of the equipment in ESA’s service module protrudes into the Crew Module Adapter. 

ATV-4 docking
ATV-4 docking

During launch the service module fits into a 5.2 m-diameter housing. Once Orion is above the atmosphere and the rocket fairing is jettisoned, the service module’s solar array unfolds to span 19 m.

The spacecraft resembles ESA’s Automated Transfer Vehicle, from which it evolved. Five Automated Transfer Vehicles delivered supplies to the International Space Station and helped to keep the outpost in orbit.

Three types of engine push Orion to its destination and can turn it in all directions to align the spacecraft as needed.

European Service Module test article
European Service Module test article

Inside the Service Module, large tanks hold fuel as well consumables for the astronauts: oxygen, nitrogen and water.

Radiators and heat exchangers keep the astronauts and equipment at a comfortable temperature, while the module’s structure is the backbone of the entire vehicle, like a car chassis.

The European Service Module is built by main contractor Airbus Defence and Space, with many companies all over Europe supplying components. The final product is assembled in Europe before being shipped to NASA in the USA.

Read more about the elements of the European Service Module for Orion through the links on the left.

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