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Five spacecraft are currently investigating Mars, and a number of new missions to the Red Planet either have been launched or are in development. They are designed to probe the surface, subsurface, and atmosphere with a host of scientific instruments. Where will they make new discoveries? Clues to where they should focus investigations can be gleaned from a new geologic map of the planet (Fig. 1) [ Tanaka et al., 2014].
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Kenneth L. Tanaka (2014) studied this question.
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