播出2012年10月17日敬请关注！
简介：DallasCampbelllooksbackthroughalmost50yearsoftheHorizonarchivestochartthescientificbreakthroughsthathavetransformedourunderstandingoftheuniverse.FromEinstein'sconceptofspacetimetoalienplanetsandextradimensions,sciencehasrevealedacosmosthatismorebizarreandmorespectacularthancouldhaveeverbeenimagined.Butwitheverybreakthrough,evenmoreintriguingmysteriesthatliebeyondarefound.Thisgreatjourneyofdiscoveryisonlyjustbeginning.…