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Nature 459, 920-921 (18 June 2009) | doi:10.1038/459920a; Published online 17 June 2009

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Planetary science: Io's escape

Gerald Schubert1

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According to the latest study, our witnessing of the volcanic splendour of Jupiter's moon Io might just be a lucky circumstance. The odds are that the satellite will become quiescent on its escape from orbital custody.

Jupiter's moon Io is about the same size as our Moon, but the similarities end there. Its motion around Jupiter is tightly constrained by its gravitational interactions with the giant planet and with two of Jupiter's other moons, Europa and Ganymede.

  1. Gerald Schubert is in the Department of Earth and Space Sciences and the Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095–1567, USA.

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