Types of Civilizations by Kardashev Discuss Types of Civilizations by Kardashev http://www.hidden-truth.org/aliens/types-of-civilizations-by-kardashev Wed, 22 May 2013 18:56:07 +0000 JComments SeakeR says: http://www.hidden-truth.org/aliens/types-of-civilizations-by-kardashev#comment-22 SeakeR Mon, 12 Apr 2010 20:31:20 +0000 http://www.hidden-truth.org/aliens/types-of-civilizations-by-kardashev#comment-22