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Ready for an intergalactic adventure? Take this virtual flight over Mariner Valley, Mars's version of the Grand Canyon, a geological feature as deep as Mt. Everest and as wide as the distance from New York to Los Angeles. Kind of makes Earth's biggest dry river bed seem a bit less "Grand," doesn't it?

This video, created by the Jet Propulsion Laboratory, includes a mosaic image of the Mariner Valley that was compiled at Arizona State University using photos taken by the Thermal Emission Imaging System (THEMIS) from NASA's Mars Odyssey orbiter. Click "play" below to watch (QuickTime plugin required), or right-click here to save a version formatted for your video iPod.

You'll need the QuickTime plug-in to view this video. Download it here for free if you don't already have it installed.