In today's image, we see Valles Marineris, a great canyon stretching across the face of Mars. It is much longer than our own Grand Canyon on Earth, by a factor of four and was not formed by running water like the Grand Canyon on Earth.

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This Podcast is an authorized New Media Mirror Site for APOD. You can access the image and website directly at: Astronomy Picture of the Day. You can use the archive link below the image to select the photo corresponding to the date of this podcast.

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