NASA's exploration of the solar system has often included magnetometers (e.g., Voyager, Mariner 10) to provide insight into the deep interior of the planets. Recently, however, a pair of magnetometers aboard the orbiting Mars Global Surveyor (MGS) satellite detected an unmistakable magnetic signature from the Martian crust. The magnetic signatures record tectonism from Mars' infancy—four billion years ago. The maximum magnetic field measured by MGS from the Martian crust is 20 times larger than that measured by earth-orbiting satellites at a comparable altitude. As on earth, interpretation of these magnetic fields aids in identification of provinces of interest for mineral...

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