Washington, Dec 21 : Using NASA’s Mars Reconnaissance Orbiter data, researchers have detected cumulative growth of erosion-carved troughs that may be infant versions of larger features known as Martian “spiders,” which are radially patterned channels found only in the south polar region of the Red Planet. [NK US] The troughs are resulting from the same thawing-carbon-dioxide process believed to form the spider-like features, the researchers said.