Generation Ship

A ship containing a full complement of personnel intended to make a sub-light journey accross space.

Since such journeys take years, or even decades, the crew and passengers of the ship expect to give birth, live and die naturally during the course of the journey.

The subsequent generation of the original crew and passengers being the ones who actually arrive at their destination.

Generation Ships are sometimes referred to, incorrectly, as Sleeper Ships, which are similar, except that the majority, or all of the passengers and crew are put into lo-berths/hibernation for the duration of the journey.