A series of acidic streams in Dorset, United Kingdom, resemble Mars billions of years ago, which could help scientists find microbial life on Mars
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VIDEO: Proton rocket reaches launchpad with Mars spacecraft
The Russian rocket prepares for blast off on Monday, carrying ExoMars 2016
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What would Martian life be like?
Astrobiologist Charles Cockrell tells us what creatures we might find on Mars
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