The Saturn V third stage is a medium-sized part that is used on the Saturn V rocket. It performs the final burn to get the payload to orbit, and can also be used for an escape burn for a payload. When used with the Apollo Command/Service Module and the Lunar Excursion Module, it performs trans-Lunar injection for both modules. When this stage is separated, it will remain in the universe, unless there was a payload inside of it before it was separated.