NASA's Mars rover analyzes soil samples

At a meeting Monday morning in San Francisco, NASA said Curiosity's discovery of chemical diversity in the Martian soil forms what the space agency called a solid baseline for continued exploration.

The $2.5 billion Curiosity landed on Mars in August. Its mission is to determine if Mars has ever been able to support microbial life. It's already discovered an ancient stream bed where water may have flowed thousands of years ago.

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