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Hallowed Hollows
The hollows of Mercury continue to fascinate. Although several mechanisms have been proposed to explain their formation, there is as yet no clear model for their origin. Hollows almost always occur within or surrounding impact features, but these interesting landforms continue to elude. Here, hollows occur on the smooth floor and terraced walls of an unnamed crater at mid-latitudes in Mercury's northern hemisphere.
Date acquired: October 13, 2012
Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington