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Naked Science: Close Encounters

Dr. Rosalba Bonaccorsi of the University of Trieste, Italy, collects samples of sand from the Mojave desert for the study of microbial life in an extremely dry environment. The purpose of this study is to determine how microbial life may survive on the extreme environments of other planets, in particular Mars.
Explore one of the most popular and controversial questions of our time: Has planet Earth ever had a close encounter with aliens?