* Astronomy

Window to a watery past on Mars

The scene, 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 colour 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
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