Mars lander sees falling snow

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NASA's Phoenix Mars Lander has detected snow falling from Martian clouds. NASA scientists said the snow was vaporizing before reaching the planet's surface. The 90-day Phoenix Rover mission, which began in May, was extended for a further five weeks after water was identified in a soil sample on the rocky Red Planet. Scientists sifting through the data collected by the solar-powered explorer are hoping to answer the key question of whether life on Mars once existed. Helen Long reports.


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