Abstract
Was there—is there—life on Mars? Is the jovian moon Europa covered by an ocean of slushy ice or liquid water, the sine qua non of life, beneath a crust of ice? If life exists in an ocean on Europa, might it have evolved beyond the level of bacteria? Are there other planets in the universe with a climate like Earth's? Does life exist on those planets? Provocative questions. The stuff of science fiction. But these questions have gained in urgency since the announcement in August that a team of National Aeronautics & Space Administration and Stanford University scientists had detected what they believe is solid evidence for the existence of microfossils in a meteorite that came from Mars. In this week's cover story, C&EN Assistant Editor Elizabeth K. Wilson takes an in-depth look at efforts to determine whether life exists elsewhere in the solar system or the universe (see page 27). She focuses in particular ...
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