Saturn moon delights and baffles

Space scientists say their discoveries about Saturn's moon Enceladus are stunning, if just a little baffling. Using the instrument-packed Cassini probe, they have confirmed that the 500km-wide world has an atmosphere. They have also seen a "hotspot" at the icy moon's south pole, which is riven with cracks dubbed "tiger stripes".

But the US and European scientists told a London meeting they could not yet explain fully the energetic processes driving all the activity on Enceladus.
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