'Happy face' crater on Mars These images, taken by the High
Resolution Stereo Camera (HRSC) on board ESA's Mars Express
spacecraft, show the Galle Crater, an impact crater located on
the eastern rim of the Argyre Planitia impact basin on Mars. The
HRSC obtained these images during orbits 445, 2383, 2438, 2460
and 2493 with a ground resolution ranging between 10-20 metres
per pixel, depending on location within the image strip. The
images show Crater Galle lying to the east of the Argyre
Planitia impact basin and south west of the Wirtz and Helmholtz
craters, at 51° South and 329° East. The images of the 230 km
diameter impact crater are mosaics created from five individual
HRSC nadir and colour strips, each tens of kilometres wide. A
large stack of layered sediments forms 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. Crater Galle, named
after the German astronomer J.G.