Airbus
Orion ESM
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Journey around the Moon
The Journey
About Orion ESM
Consumable storage (for later  crewed flights)
The ESM as part of the Orion spacecraft
Enjoy the journey around the Moon
Thermal control
Solar array canting during Main engine burn
European Service Module (ESM)
Crew Module
Crew Module Adapter
Electrical power supply
Solar array unfolded
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Reaction  control/auxiliary thruster 
1st European supply of critical functions for a NASA space mission
Main engine
On its first mission, the unmanned Orion spacecraft will fly to the moon and back proving the performance of all critical systems and resilience of the astronaut capsule during high-speed re-entry and splashdown on earth.  Under an ESA contract, Airbus is building the European Service Module (ESM) that will power the spacecraft and hence provide critical functions during the whole mission:
Main engine propulsion 
About Orion ESM
Trans-Lunar Injection
Active Orion ESM functions
Main engine propulsion 
ESM on stand-by for Abort to Orbit Manoeuvre in case of emergency
Main engine burn for insertion
Main engine burn (185 km above surface)
70.000 km
8
Trajectory correction manoeuvres
Solar arrays canted for launcher upper stage TLI burn. ESM propulsion on stand-by for launcher/spacecraft separation
Main engine burn to return towards Earth
Distant Retrograde Orbit departure
9
Distant Retrograde Orbit arrival
Distant Retrograde Orbit
Inbound powered Lunar fly-by
12
10
Re-entry
Inbound coasting phase
11
Crew Module/Service Module separation
Re-entry
Launch
384.000 km from Earth to Moon
Reaction  control/auxiliary thruster 
7
1
2
Low Earth Orbit
Solar array deployment
3
5
Crew Module/Service Module separation
Back
Outbound coasting phase
4
Outbound powered Lunar fly-by
6
Next time, we’ll fly astronauts to the Moon
Exploration Mission 1 – the Journey
Main engine burn
ESM and Crew Module Adapter burn up