Last updated on April 21, 2014 at 11:58 EDT
Happy Face Crater
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Happy Face Crater

June 3, 2003
Every day, the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide angle instruments obtain a global view of the planet to help monitor weather and seasonal patterns of frost deposition and removal. The two pictures shown here are taken from the same daily global image mosaic (the only difference is that each was processed slightly differently). The pictures show Galle Crater, informally known as Happy Face, as it appeared in early southern winter. The white-ish gray surfaces are coated with wintertime carbon dioxide frost. The pattern of frost distribution gives the appearance that Happy Face has opened its mouth. Galle Crater is located on the east rim of Argyre at 51°S, 31°W. Sunlight illuminates the scene from the upper left. Galle Crater is 230 km (143 mi) across.