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A wide-angle NASA image compiled from all the photographs sent by satellites that orbited Mars from Viking in the 1970s to today's Martian orbits provides a spectacular view of Vallis Marineris - the Grand Canyon of Mars in the WorldWide Telescope screenshot. Photo: NASA/Microsoft

A wide-angle NASA image compiled from all the photographs sent by satellites that orbited Mars from Viking in the XNUMXs to today's Martian orbits provides a spectacular view of Vallis Marineris - the Grand Canyon of Mars in the WorldWide Telescope screenshot. Photo: NASA/Microsoft

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