APOD
The Grand Canyon of Mars
July 20, 1995
About This Image
July 20, 1995 The Grand Canyon of Mars Picture Credit: NASA,Viking Project,USGS Explanation: The Mariner Valley, also known as the Valles Marineris canyon system, appears in this mosaic of images from NASA's Viking spacecraft as a huge gouge across the red planet. This "Grand Canyon" of Mars is about 2500 miles long and up to 4 miles deep. By comparison, the Earth's Grand Canyon is less than 500 miles long and 1 mile deep. For more information about Mars see Calvin J. Hamilton's Mars Page. The exploration of Mars is chronicled by the Center For Mars Exploration. We keep an archive of Astronomy Pictures of the Day. Astronomy Picture of the Day is brought to you by Robert Nemiroff and Jerry Bonnell . Original material on this page is copyrighted to Robert J. Nemiroff and Jerry T. Bonnell.
On This Day in Space History
On July 20, 1969, Apollo 11 landed on the Moon, and Neil Armstrong became the first human to walk on another world.
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