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Since arriving at Mars on Oct. 24, 2001, NASA's 2001 Mars Odyssey orbiter has mapped the composition of the Martian surface, providing a window onto the past so scientists can use that data to piece together how the planet evolved. It has also served as a vital asset in relaying communications between landers and rovers on the Red Planet and mission teams back on Earth. Here are some of the highlights of the mission: Completed 100,000 orbits Captured more than 1.4 million images Returned 17.2 terabits of science data to Earth, including 1.3 terabits of data relayed from Mars surf…