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A variant using nanotechnology to escape Earth: self‑replicating molecular assemblers that build space infrastructure from asteroid dust, programmable matter that becomes any tool, and nanomedicine that makes long‑term space travel survivable. Adherents argue that nanotech can “print” an interstellar civilisation atom by atom, leaving Earth completely untouched. No strip‑mining, no pollution—just clean, molecular‑scale construction. Critics call it grey goo optimism, but fans insist that proper oversight prevents accidents.
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