Phoenix probe lands on Mars (Update 4)

NASA's Phoenix spacecraft landed in the northern polar region of Mars Sunday to begin three months of examining a site chosen for its likelihood of having frozen water within reach of the lander's robotic arm.

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<p><a href="http://www.physorg.com/news130964343.html">Phoenix probe lands on Mars (Update 4)</a></p> <p>NASA's Phoenix spacecraft landed in the northern polar region of Mars Sunday to begin three months of examining a site chosen for its likelihood of having frozen water within reach of the lander's robotic arm.</p>