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A New Look at Ancient Mars

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A mosaic of a hundred and two orbital images, depicting the entirety of the Valles Marineris, a canyon system some two thousand miles long and as much as five miles deep.

Credit: NASA/J.P.L.-Caltech

Among Earth/s planetary neighbors, Mars has been the one on which humanity has most often, and most variously, projected its hopes and fears.

From The New Yorker
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