Life Beyond Earth

An ocean on Mars. An Earth-like planet light years away. The evidence is mounting, but are astronomers ready to say we're not alone?

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"We believe that life, as we know it, needs water to exist, but the presence of water does not imply the existence of life," says Barman. "Without some direct evidence, it will be very hard to say if life, in one form or another, is present on any planet."'s reader forum


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