World News | Kenneth Chang, New York Times | Saturday September 4, 2010
For all the triumph of NASA's 1976 Viking mission, which put two unmanned spacecraft on Mars, there was one major disappointment: The landers failed to find carbon-based molecules that could serve as the building blocks of life.The complete lack of these organic molecules was a surprise, and the notion of a desolate, lifeless Mars persisted for yea...
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