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SULFUR STREAKS

Red streaks visible on Europa’s surface (bottom) may be akin to yellow streaks currently under study in the Canadian High Arctic (top). The Arctic streaks are rich in sulfur and may be produced by a community of microbes living nearby. Scientists are now looking for remote markers of such life. Credit: From Top: D. Gleeson, NASA, JPL; NASA, JPL, Univ. of Arizona, Univ. of Colorado

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