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By European Space Agency June 8, 2017 New composite images captured by ESA’s Mars Express offer a window into the watery past of the Red Planet.

This 70 km-wide crater and its surrounds, captured by ESA’s Mars Express, is a composite of two images taken in March 2007 and February 2017.

It focuses on a large crater in the Margaritifer Terra region in the southern hemisphere of Mars, and includes a portion of Erythraeum Chaos to the north (right in the main color image below).

The region is located at the northern edge of Noachis Terra, which at 3.7–4 billion years old, represents some of the oldest and most heavily cratered terrain on Mars.

Remnants of valley networks across the scene indicate that water once flowed through this region, shaping the features seen today. Indeed, as shown by the context image, Parana Valles lies to the east, while Loire Valles lies to the northwest. There are a number of distinctive features inside the 70 km crater, such as the striking light-toned material that is interpreted as exposed bedrock.

‘Chaotic terrain’ is visible both inside and outside the crater, marked by randomly oriented blocks separated by troughs.

In general, chaotic terrain is associated with the collapse of the surface above regions where large amounts of subsurface water have been released, for example by the sudden melting of ice. As such, outflow channels often begin in chaos terrains.

Chaotic terrain may also mark the sites of ancient lakes, such as in Erythraeum Chaos to the north (right) of the crater in the included images, between Loire and Parana Valles.

 Plate Tectonics Discovered on Mars ESA’s Mars Express View Remnants of Mega-Flood on Mars New Research Identifies Possible Sites of Frozen, Watery Deposits on Europa Images from ESA’s Mars Express Reveals the Features of Ladon Basin New Study Adds Clues about Possible Water in Mars Canyons Data Suggests the Possible Presence of Ice at Shackleton Crater

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