When Galileo met Ganymede

@article{Stevenson1996WhenGM,
  title={When Galileo met Ganymede},
  author={David J. Stevenson},
  journal={Nature},
  year={1996},
  volume={384},
  pages={511-512}
}
Jupiter's satellite Ganymede has a magnetic field. Its cause could be an internal dynamo that was kick-started a billion years ago when the satellite was temporarily pushed into a more eccentric orbit. 
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