Way down in the belly of the Orion spacecraft is a large cylindrical module built in Europe that provides almost everything the crew requires to safely return to Earth after a voyage to the Moon. The European Service Module houses all of the propulsion systems that maintain the crew safe and comfortable until splashdown, including power, water, air, and temperature control for all four astronauts. It was manufactured by Airbus for the European Space Agency, weighs a whopping thirteen tons and measures roughly four meters across and tall.
