Season 1 · Episode 10
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Mars: Earth That Never Was
Mon, Dec 21, 2009
Did Mars long ago develop far enough for life to arise? If so, does anything still live somewhere underground? The search for answers has revealed the forces that long ago doomed the Red Planet.
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Airs
Mon, Dec 21, 2009
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Cosmic Journeys
37 episodes
Episode
S1 · E10
in Cosmic Journeys
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S1 · E11
The Search for Earth-like Planets
Fri, Jan 8, 2010