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Do extraterrestrial landscapes or planets count as nature?

One possible criteria could be that nature is what is natural, not anthropogenic or artificial. This could then be subdivided into fertile nature or sterile nature. Earth with lifeforms, even if it's ...
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Calculating "maximum" distance to an alien civilization

Suppose civilizations are randomly distributed in the galaxy (not necessarily evenly, but independent of each other). That means that there is a CDF $\Pr[d<x]=F(x)$, the probability for the ...
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