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That exact argument could be made against disaster recovery data centers. Why bother building a new data center and buying two servers when you could just have one and save tons of money?

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There's no place in the solar system that's remotely as habitable as Earth, even if the latter suffers a massive disaster.

Space exploration is more like Amazon spending $100B to build a hut with 10 Arduinos on the summit of Mt. Everest.

The argument isn't that we shouldn't colonize other planets because it's expensive, it's that we shouldn't colonize other planets because it's Pareto inferior to making orbital habitats.

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