AS VISITED BY THE DOCTOR
The Tenth Doctor: the year 100 trillion, almost the end of the universe. [Utopia, RTD3.11]
Universe: Normal space.
Galaxy: At this time, there are no galaxies – they have all collapsed. [The Doctor Who universe ends then as the Heat Death (extreme expansion) theory rather than the Big Crunch theory (extreme contraction.)]
Human Colony: A human gathering rather than a colony.