VALLES MARINERIS, MARS - Mars' own Grand Canyon, Valles Marineris, is shown on the surface of the planet in this composite image made aboard NASA's Mars Odyssey spacecraft. The image was taken from a video featuring high-resolution images from Arizona State University's Thermal Emission Imaging System multi-band camera on board the spacecraft. The mosaic was then colored to approximate how Mars would look to the human eye. Valles Marineris is 10 times longer, five times deeper and 20 times wider than Earth's Grand Canyon. (Photo by NASA/Arizona State University via Getty Images)
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