Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Voyager spacecraft images of Europa's surface , like the one above, are suggestive of sea ice on Earth . This tantalizing prospect of oceans of liquid water beneath its frozen surface has helped make the smallest of the Galilean moon's of Jupiter a planned focus of the Galileo spacecraft's ongoing mission to explore the Jovian system.
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