 Radar studies preceding and following the <unk> <unk> mission demonstrate that the inner walls of <unk> are similar in reflective characteristics to those of some <unk> craters . In particular , the surroundings appear to contain a significant number of blocks in its <unk> blanket , suggesting that its radar properties are a result of surface <unk> , and not ice deposits , as was previously suggested from a radar experiment involving the <unk> mission . This interpretation , however , is not universally agreed upon within the scientific community . Radar images of the crater at a wavelength of 13 cm show no evidence for water ice deposits . 
