Mars' core and magnetism

@article{Stevenson2001MarsCA,
  title={Mars' core and magnetism},
  author={David J. Stevenson},
  journal={Nature},
  year={2001},
  volume={412},
  pages={214-219}
}
The detection of strongly magnetized ancient crust on Mars is one of the most surprising outcomes of recent Mars exploration, and provides important insight about the history and nature of the martian core. The iron-rich core probably formed during the hot accretion of Mars ∼4.5 billion years ago and subsequently cooled at a rate dictated by the overlying mantle. A core dynamo operated much like Earth's current dynamo, but was probably limited in duration to several hundred million years. The… 

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