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Astronomers found evidence, in the form of newly carved gullies, that liquid water has flowed on Mars within the last five years; skeptics suggested that the channels were made by avalanches of carbon dioxide or rivers of dust.

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Astronomers found evidence, in the form of newly carved gullies, that liquid water has flowed on Mars within the last five years; skeptics suggested that the channels were made by avalanches of carbon dioxide or rivers of dust.

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