29 septiembre 2014
For decades, planetary geologists have speculated that glaciers might once have crept through Valles Marineris, the 2000-mile-long chasm that constitutes the Grand Canyon of Mars. Using satellite images, researchers have identified features that might have been carved by past glaciers as they flowed through the canyons; however, these observations have remained highly controversial and contested.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/sfk9NfJDvII/140929154248.htm
