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Scientists ponder tantalizing clues that oceans exist on Jupiter's icy moon.
Arctic permafrost may hold clues to life on other worlds. Four Facts about Extremophiles Extremophiles are microbes that thrive in harsh conditions that would kill most creatures. The hunt for signs of ancient life on Mars is leading scientists to an other-worldly lake on Earth. Three decades after Apollo 12, a remarkable colony of lunar survivors revisited. In 1966 some common bacteria called streptococcus mitis inadvertantly stowed away inside NASA's Surveyor 3 moon probe.