The human future in the cosmos could be all but limitless, if we don’t destroy ourselves first. The same would be true of intelligent aliens elsewhere in the Universe, assuming they exist: how far they travel depends strongly on how long they survive as a species. That survival variable, which the US astronomer Frank Drake incorporated into his famous equation on the likelihood of technological civilisations beyond Earth, is unknowable at present because we are the only such civilization yet identified. Let’s be optimistic and assume that humans are persistent, working their way through the manifest problems of mastering their…
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