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Mars vs. Europa: Are We Looking in the Wrong Place For Alien Life?

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Earth, Europa, Mars

Relative sizes of Earth, Mars and Europa, an icy moon of Jupiter.

Credit: NASA/JPL-Caltech/MSSS

A British astrobiology conference has revived a years-old debate over the best place to look for life elsewhere in the solar system: Mars, or the moons of Jupiter and Saturn?

From NBC News
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