Level 5 planet: Difference between revisions

While a [[level 2 planet]] in the [[1940s]], ([[PROSE]]: ''[[Ghosts of India]]'') [[Earth]] became a level 5 civilization by [[1957]], ([[PROSE]]: ''[[First Frontier]]'') remaining at that status through [[1979]], ([[TV]]: ''[[City of Death]]'') [[2008]], ([[TV]]: ''[[Voyage of the Damned]]'', ''[[Revenge of the Slitheen]]'', ''[[The Eleventh Hour]]'') [[2009]], ([[TV]]: ''[[Partners in Crime]]'') and into [[2040]]. ([[AUDIO]]: ''[[Phantoms of the Deep (audio story)|Phantoms of the Deep]]'') However, [[Romana I]] once referred to Earth  in [[2011]] as having a [[Level 4 planet|level 4 civilization]]. ([[AUDIO]]: ''[[Ferril's Folly]]'')