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IF expansionists chose to spare us, they'd just have to come back later. A species with a requirement of endless growth will never have enough living space or resources. That's not the only kind of species imaginable but we have an example of this kind: mankind at the moment.

So assuming expansionism, the question is, can such a species survive long enough to be a threat to us? If their societt is unstable, they may well destroy themselves before getting very far. Stability seems out of the question here - that would imply they are able to maintain a steady-state society within limits, but still have the need or impulse to hunt for new resources and living space.

So maybe we're not likely to meet such a species as it is likely to be self-destructive. One configuration is worrying, though: An expansionist species sufficiently advanced to reliably spread across space without end, but still bound to eventually exhaust any resources they find. (Inevitable for all species given entropy?)

This species will either die out or monopolize all resources it can find. (And then die out.)If it really requires constant growth, it can do nothing else.

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