Phoenix uncovers history of liquid water on Mars

By Rachel Courtland EVER since NASA’s Phoenix lander gently touched down on Mars’s bleak northern plains on 25 May, it has been unearthing tantalising hints about the planet’s potential for life. News reports have been full of its baby steps: the probe’s first tentative scoops of soil, struggles with oven doors on one of its instruments, and efforts to unload sticky, icy soil for testing. Then last week, the Phoenix team announced a surprising discovery:
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