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 module weighs almost 8,000 pounds and carries almost 19,000 pounds of propellant. The cylindrical module is unpressurised and approximately three meters long, including the main engine and tanks for gas and propellant. It utilizes three different types of engines push Orion to its destination and can maneuver in all directions to align the spacecraft as needed. 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 service module is the powerhouse of the spacecraft as it provides in-space maneuvering capability, power, and other commodities necessary for life support, including consumables for the astronauts, like water, oxygen and nitrogen.
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