Ifwefacedacountdowntodestruction,couldwebuildaspacecrafttotakeustonewandhabitableworlds?CanweEvacuateEarth?NGC'stwo-hourspecialexaminesthisterrifyingbutscientificallyplausiblescenariobyexploringhowwecouldunitetoensurethesurvivalofthehumanrace.
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