Forty-two years after NASA’s twin Viking landers looked for organics on Mars, the Curiosity rover has found them, setting the stage for a focused search for signs of life. Six months after its August 2012 landing inside a 96-mi. (154-km) wide impact crater near Mars’ equator, Curiosity drilled out a teaspoon of gray powder from a what had once been a water-soaked rock and found key ingredients necessary for life. The discovery of sulfur, nitrogen, hydrogen, oxygen, phosphorus ...

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