LOS ANGELES (AP) - NASA scientists say tests on a Mars rock show the planet could have supported primitive life.
    
The analysis was done by the rover Curiosity, which drilled into the rock, crushed it and tested a tiny sample. The rover was the first spacecraft sent to Mars that could collect a sample from deep inside a rock.
    
At a briefing at NASA's Washington headquarters on Tuesday, NASA scientist said the rock contains clay minerals that formed in a watery environment - an environment that may be favorable for microscopic organisms.
    
Curiosity had already found a hint of the site's watery past - an ancient streambed that the six-wheel rover crossed to get to the flat bedrock.
    
The rover made a dramatic landing near the Mars equator last August for a two-year mission.

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