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Last Updated: Wednesday, 13 December 2006, 10:34 GMT <br /><br /><br /> <br />Mountain range spotted on Titan <br />By Jonathan Amos <br />Science reporter, BBC News, San Francisco <br /><br /><br /> <br />Titan's Sierras are the biggest mountains yet seen on the moon<br /><br /><br />More details<br /> <br />The Cassini spacecraft has spied the tallest mountains yet seen on Titan, Saturn's major moon. <br /><br />The range is about 150km long (93 miles), 30km (19 miles) wide and about 1.5km (nearly a mile) high. <br /><br />The feature was identified by the probe on a recent pass, using a combination of radar and infrared data. <br /><br />Dr Bob Brown, one of the scientists behind the discovery, said it reminded him of the Sierra Nevada mountains in the western US. <br /><br />"One could call them Titan's Sierras," the University of Arizona-Tucson researcher added. <br /><br />The mountains lie south of the equator. Scientists told the American Geophysical Union (AGU) Fall Meeting that the range was probably as hard as rock, but made of icy materials. <br /><br />The mountains appear to be coated with layers of organic, or carbon-rich, material. This could be methane "snow". <br /><br />Impact story <br /><br />Titan is smothered in a thick photochemical haze, so Cassini must use instruments other than its optical camera system to see features such as these mountains. <br /><br />Dr Brown, who leads Cassini's Visual and Infrared Mapping Spectrometer (Vims) team, said <br /> <br />