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Nature 448, 37 (5 July 2007) | doi:10.1038/448037a; Published online 4 July 2007

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Planetary science: Hyperion the sponge

Richard Webb

On 1 July 2004, seven years after its launch from Earth, NASA's Cassini orbiter fired its main engine, throttled back its speed and allowed itself to be pulled in by Saturn's gravity. In the three years since then, the spacecraft has provided snapshots of the strange and fascinating worlds that inhabit the Saturn system: the eerily Earth-like Titan, for instance, the rain on whose plains is mainly methane; or Enceladus, from near whose 'tiger-striped' southern pole an icy plume spouts into space.

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