SUMMARY: Cassini has obtained fascinating new images of the surface of Saturn's moon Enceladus. The spacecraft made its closest flyby so far on July 14, when it passed only 175 km (109 miles) within the moon's southern pole. This region is strangely free of impact craters, but it is littered with house-sized ice boulders. Enceladus has the most reflective surface in the solar system; it's as pure and white as freshly fallen snow. These gigantic blocks of ice were a complete surprise to scientists and they'll take some time to figure out what could have caused them.

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