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Heaven and Hell

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In this episode of Cosmos, Carl Sagan pays particular attention to the life of comets and asteroids, whose fate often innevitably ends in destruction. He then goes onto to look at Earths sister planet Venus and despite striking correlations with Earth, is an extremely hostile and volcanic world. Once thought to be inhabited by an alien civilization our cosmis neighbout has been in self destruct mode due to an over active natural green house effect, sending a clear warning to the continual climate change on Earth. 

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