Crater Galle, the 'happy face' on Mars, c 2004-2006.
© European Space Agency / Science & Society Picture Library
This image, obtained by the High Resolution Stereo Camera (HRSC) on the European Space Agency's Mars Express, is a mosaic of overlapping images gathered during five separate orbits. The ground resolution ranges between 10-20 metres per pixel, depending on location within the image strip, and the crater is shown lying near 51degrees South and 329 degrees East. North is up. The image shows Crater Galle containing a large stack of layered sediments forming an outcrop in the southern part of the crater. Several parallel gullies, possible evidence for liquid water on the Martian surface, originate at the inner crater walls of the southern rim.