In Isaac Asimov's future history series, mankind spreads from Earth out into the Galaxy. However, we do not yet know whether this is true. Maybe "mankind" is currently evolving on many terrestroid planets and will converge to form an interstellar civilization that will become a Galactic Empire? In Poul Anderson's short story,
"Details," humanoid beings differing only in superficial bodily features do evolve on many terrestroid planets. However, that was not serious speculation by Anderson. And there is no suggestion that these different humanoid races would be interfertile.
Although many humanities have not yet been disproved, they are surely so improbable that they can be ruled out. However, we can hope to get more positive knowledge of extra-solar life in our lifetimes.
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