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Mark H
Mars Express Captures Stunning Image of an Ancient River Valley formed During the the Hesperian Epoch - http://www.dailygalaxy.com/my_webl...
Mars Express Captures Stunning Image of an Ancient River Valley formed During the the Hesperian Epoch
Mars Express Captures Stunning Image of an Ancient River Valley formed During the the Hesperian Epoch
Mars Express Captures Stunning Image of an Ancient River Valley formed During the the Hesperian Epoch
"Reull Vallis, the river-like structure in these images, is believed to have formed when running water flowed in the distant martian past, cutting a steep-sided channel through the Promethei Terra Highlands before running on towards the floor of the vast Hellas basin. This sinuous structure, which stretches for almost 1500 km across the martian landscape, is flanked by numerous tributaries, one of which can be clearly seen cutting in to the main valley towards the upper (north) side. These structures are believed to be caused by the passage of loose debris and ice during the 'Amazonian' period (which continues to this day) due to glacial flow along the channel. The structures were formed long after it was originally carved by liquid water during the Hesperian period, which is believed to have ended between 3.5 billion and 1.8 billion years ago." - Mark H from Bookmarklet