<p>Ifwefacedacountdowntodestruction,couldwebuildaspacecrafttotakeustonewandhabitableworlds?CanweEvacuateEarth?NGC’stwo-hourspecialexaminesthisterrifyingbutscientificallyplausiblescenariobyexploringhowwecouldunitetoensurethesurvivalofthehumanrace.</p>