It is 1150 days after leaving Earth orbit, and is in the midst of a major project. Throughout their captive journey through space, the various scientific departments have each acquired tremendous quantities of data. This data is now being reviewed and uploaded to the Main Computer memory banks. While the Research Section concentrates on this endeavour, the non-scientific personnel are enjoying a bit of a rest. The relaxed atmosphere in is interrupted, however, when Computer begins displaying "new" data indicating a gradual but increasing change in the Moon's trajectory.