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read the article 'Ribbon Cutting'
09.19.2016 Ribbon Cutting
This map is based on gamma rays from the element potassium, which is about twice as abundant on Mars as it is on Earth.
08.24.2004

Gamma ray map

This map is based on gamma rays from the element potassium, which is about twice as abundant on Mars as it is on Earth.

Image Credit: NASA/JPL/University of Arizona


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