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Summary
With its first sample of martian rock, the Curiosity rover has achieved the primary objective of its $2.5 billion mission. Mars scientists have shown that, at least in one place and time on ancient Mars, life as we know it could have survived: Prolonged benign wetness, the essential building blocks of life, and an energy source were all on Mars. As to ancient martian life itself—the focus of public interest—the news has been a letdown.
