NASA: Closest planet to sun, Mercury, harbours ice !!
A Mosaic of MESSENGER Images of Mercury's North Polar Region: All of the larger polar deposits are located on the floors or walls of impact craters. Deposits farther from the pole are seen to be concentrated on the north-facing sides of craters. (Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington/National Astronomy and Ionosphere Center, Arecibo Observatory)