On an interstellar scale, populations could become separated indefinitely or forever.
In Robert Heinlein's Future History, descendants of mutineers and mutants wander through space enclosed in a generation ship until some escape in a boat and settle on a planet.
In Poul Anderson's Psychotechnic History;
a starship is lost in space - its crew settles on a planet, then some become the first interstellar Nomads;
a starship crashes on an uninhabited planet - the crew's descendants are contacted three centuries later;
five couples are stranded on an inhabited planet - two generations later, their families return to space.
In Anderson's Technic History, descendants of political exiles are discovered millennia later when they are no longer human.
1 comment:
Kaor, Paul!
Given a FTL drive, populations don't have to always or all of them be permanently lost to contact with one another and at least some intermixing. Which is what we see during the eras of the Polesotechnic League and Terran Empire.
Another, and perhaps better example of a lost planet whose inhabitants can be said to no longer be human is Gwydion. The Kirkasanters, after all, are eminently and admirably able, energetic, and reasonable people.
Ad astra! Sean
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