Hope that a future astronaut might some day find life on Mars faded deeper than ever into science fiction when Mariner 4 sent its remarkable snapshots across 135 million miles of space. The bleak, pocked surface of the red planet looked dead indeed. Because they saw no signs of erosion, space specialists from Caltech's Jet Propulsion Laboratories, who had directed the Mariner voyage, concluded that Mars probably never had any significant amount of life-supporting water. Though they were not quite ready to deny the possibility of Martian life, the JPL men seemed all but certain that what they could not...
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