This image released by NASA shows the work site of the NASA’s rover Curiosity on Mars. Results are in from the first test of Martian soil by the rover Curiosity: So far, there is no definitive evidence that the red planet has the chemical ingredients to support life.Scientists said Monday, Dec. 3, 2012 that a scoop of sandy soil analyzed by the rover's chemistry lab contained water and a mix of chemicals, but not the complex carbon-based compounds considered necessary for microbial life. (AP Photo/NASA)

Associated Press
This image released by NASA shows the work site of the NASA’s rover Curiosity on Mars. Results are in from the first test of Martian soil by the rover Curiosity: So far, there is no definitive evidence that the red planet has the chemical ingredients to support life.Scientists said Monday, Dec. 3, 2012 that a scoop of sandy soil analyzed by the rover's chemistry lab contained water and a mix of chemicals, but not the complex carbon-based compounds considered necessary for microbial life. (AP Photo/NASA)
This image released by NASA shows the work site of the NASA’s rover Curiosity on Mars. Results are in from the first test of Martian soil by the rover Curiosity: So far, there is no definitive evidence that the red planet has the chemical ingredients to support life.Scientists said Monday, Dec. 3, 2012 that a scoop of sandy soil analyzed by the rover's chemistry lab contained water and a mix of chemicals, but not the complex carbon-based compounds considered necessary for microbial life. (AP Photo/NASA)
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