Cuatro Ciénegas Basin, a gypsum-rich area of Mexico’s Chihuahua Desert. Gypsum forms when sulfate- and calcium-rich salt water e
The Curiosity rover broke scientific ground in February 2013 when one of its instruments drilled into a rock and sent back images of gray rock powder. It was the first time a rover had sampled the interior of a rock from another planet. Attention will remain focused on Mars in the coming months as Curiosity makes its way toward Mount Sharp, a large sediment pile in the center of Gale Crater. But to understand why Curiosity was sent to Gale Crater and Mount Sharp, you need to look at Earth and Cuatro Ciénegas Basin, a gypsum-rich area of northern Mexico’s Chihuahua Desert. Gypsum is a mineral that, on Earth, forms when sulfate- and calcium-rich salt water evaporates. One of the key reasons Curiosity is working in Gale Crater is that scientists suspect the sediment mound at its center contains gypsum—the product of an ancient lake when Mars was a much warmer, wetter place. In 2005, the OMEGA instrument on ESA’s Mars Express orbiter detected gypsum at several locations on Mars, evidence suggesting that liquid water used to be much more common on the Red Planet. And in 2013, Curiosity bolstered the case by finding what appeared to be a series of gypsum veins in a part of Gale Crater known as Yellowknife Bay. Trace amounts of gypsum are fairly common on Earth, but since the mineral dissolves readily in water, just a handful of locations have gypsum in large quantities. The Cuatro Ciénegas Basin, home to some of the purest gypsum dune fields in the world, is one of them. The Advanced Land Imager (ALI) on Earth Observing-1 (EO-1) acquired this view of Cuatro Ciénegas Basin on January 18, 2013. Individual dunes are not visible at this resolution, but the gypsum dunes are concentrated just west of the Sierra San Marcos highlands within the bright white playa area of the image. Hundreds of springs and pools, many welling up mineral-rich waters from deep below the surface, flank the highlands to the north and east. While vegetation is primarily cactus and yucca throughout much
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