Even Mars can put on a happy face. The Martian crater Galle has internal markings reminiscent of a smiley face symbol. Such markings were originally discovered in the late 1970s in pictures taken by the Viking Orbiter . A large meteor impacted the Martian surface to form the crater . Conventional wisdom holds that the markings inside the crater are placed by chance by natural processes. The Mars Global Surveyor (MGS) spacecraft currently orbiting Mars took the above picture . MGS recently started the global surveying phase of its mission.
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Credit: Malin Space Science Systems, MGS, NASA