Coprates Chasma in the Valles Marineris on Mars, photographed by the Mars Express spacecraft. Appearing in the top half of this image, it ranges from 60-100 km wide and drops 8-9 km below the surrounding plains.
G. Neukum/ESA/DLR/FU Berlin
March 26, 2013 The wilderness is not just a thing, it's a need. It's an idea that has grown up with humans and it will follow us from this planet to the next, and beyond. Commentator Adam Frank plots our future course.
October 9, 2012 The vast web of geometries traced out in light shows you cities as a kind of infestation. They're like living networks spreading across the planet.
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