SUMMARY: When NASA's Galileo spacecraft uncovered evidence that Europa's icy surface covers a huge ocean, scientists immediately thought... life. Scientists have been analyzing pictures returned by Galileo and Voyager to find evidence of life. Several key chemical compounds, called biomarkers, could indicate life has existed on Europa. Scientists are working on ways to simulate what those biomarkers would look like after being in Jupiter's immense radiation field so spacecraft could detect them from orbit.

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