A study of the geology of Mars should reveal answers to such questions as how Mars developed into the planet we see today and what accounts for the differences and similarities between Earth and Mars. Visitors to this site can learn about ancient magnetism recently discovered by the Mars Global Surveyor that suggests the planet was once more dynamic and Earth-like with a magnetic field shielding the surface from cosmic radiation. They can read about the importance of studying the age and composition of Martian rocks, particularly those rocks and minerals which might have been formed in the presence of water. This is part of NASA's presentation of four science goals for its Mars Exploration Program, a science-driven effort to discover whether Mars was, is, or can be, a habitable world.
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