Populations of stars have been aging and evolving, so that distant galaxies (which are observed as they were in the early universe) appear very different from nearby galaxies (observed in a more recent state).
Deres bestand af stjerner er ældet og har udviklet sig, så fjerne galakser (der observeres, som de var i det tidlige univers) fremtræder meget forskelligt fra nærliggende galakser (der observeres i nyere tilstand).