NASA’s Photo Shows Mars’ Grand Canyon in Spectacular Detail
Measuring the length of the entire United States, Mars' Valles Marineris—Mariner Valley—is an enormous canyon that makes our Grand Canyon appear minuscule. Stretching across a good expanse of the Red Planet, Valles Marineris is captured in spectacular detail thanks to the work of the Viking orbiter. NASA's high-resolution mosaic of the Valles Marineris hemisphere gives a magnificent look at this canyon system.







































































