The Cosmic Record Shows Repeated Incursions From Outside - and Remaining on One Planet Keeps Us Vuln

Two developments are converging, and Randall Carlson argues their combination makes the case for space expansion not merely aspirational but existential. The first is the improving human ability to access the cosmic frontier - the technology is arriving. The second is the growing body of evidence that life on Earth's surface has been repeatedly and catastrophically disrupted by incursions from outside - impacts, airbursts, debris streams, solar events - throughout the history of the species.

The conclusion Randall draws is straightforward. As long as humanity remains confined to a single planetary surface, it remains as vulnerable as every previous civilisation that was prospering and then suddenly gone. Expansion into space does not eliminate that vulnerability overnight, but remaining on Earth guarantees it permanently. The frontier is opening at precisely the moment the geological record is making clear how badly we have always needed one.'

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