Why colonize space and/or other planets?

This is the sort of question that always precedes a colonization effort, which never occurs to anyone after the effort has borne fruit. That is, before colonization happens, the least visionary of men question the value of the endeavor, whereas after the colonies are established the very question seems rather... show more This is the sort of question that always precedes a colonization effort, which never occurs to anyone after the effort has borne fruit. That is, before colonization happens, the least visionary of men question the value of the endeavor, whereas after the colonies are established the very question seems rather stupid.

I think that the value of planting "people gardens," all by itself, constitutes a sufficient reason for space colonization. Subsequent benefits like science, technological spinoffs, cultural innovations, and interplanetary trade are extras.
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