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The Hills of Caloris
These hills make up a small portion of the southwestern rim of the 1550-km Caloris basin. This region was seen only with the sun high in the sky during MESSENGER's flybys of Mercury (and not at all by Mariner 10), so with the sun near the horizon in images like this one we are getting a great look at the surface's texture and topography.
Date acquired: July 29, 2011
Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington