The seemingly barren surface revealed by Mariner 4's remarkable photographs last July dashed the hopes of many scientists that some form of life may exist on Mars. But their pessimism may be premature. At the annual meeting of the American Association for the Advancement of Science in Berkeley last week, Harvard Astronomer Carl Sagan suggested that a Martian version of Mariner 4 would have transmitted equally discouraging pictures of the Earth. "Had the Mariner 4 vehicle passed the same distance from the Earth that it did from Mars (6,000 miles) and obtained 22 comparable photographs," Sagan declared, "no...
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