At the end of the last millennium, numerous (USSR and U.S.) spacecraft were sent to Mars to begin exploration of that planet. Mars Global Surveyor (1997 onward) is one of the successful missions that provided a detailed map of the topography and high resolution images of the surface, and also discovered unusually large remanent magnetism of the crust (up to 20 times larger than terrestrial standards).

The present-day anomalies indicate that Mars had at one time its own internal source of a planetary magnetic field from a magnetic dynamo resulting from motions of highly electrically conducting core material—similar to the...

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