Jupiter's frigid moon Europa could be one of the solar system's best bets to find extraterrestrial life. Scientists have long wondered if the moon's vast subsurface ocean, sandwiched between a rocky mantle and a global sheet of ice. could prove as habitable as Earth's early oceans. And now there is further evidence. Caltech astronomer Mike Brown and NASA planetary scientist Kevin Peter Hand have discovered a new chemical "fingerprint" on Europa's surface indicative of life: magnesium sulfate. The salt likely originated in the moon's rocky mantle before it migrated through the ocean to the surface.
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机译：木星的寒冷月亮欧罗巴可能是太阳系寻找外星生命的最佳选择之一。长期以来，科学家一直在想，是否月亮夹在一块岩石地幔和一块全球冰层之间，是一块巨大的地下海洋。可以证明与地球早期的海洋一样宜居。现在有进一步的证据。加州理工学院的天文学家迈克·布朗和美国国家航空航天局的行星科学家凯文·彼得·汉德（Kevin Peter Hand）在欧罗巴表面发现了一种新的化学“指纹”，表明生命：硫酸镁。盐很可能起源于月球的岩石地幔，然后才穿过海洋迁移到地表。
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