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The service module was attached to the control module. It was a metal cylinder 7.6 m long and 3.9 m wide, which weighed 24 520 kg. This unpressurized module contained the main engine and propeller tanks for the return trip to the moon and was launched just before the last entry into the Earth's atmosphere. In addition, there were fuel cells to create electricity and drinking water – another first – as well as the reaction control system, gyroscopes and umbilicals to provide the 39, electricity, control lines and other connections to the control module.
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