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This image shows the moon's south pole, as seen by the 1994 Clementine mission. The possibility of frozen water is one of many reasons NASA is interested in this spot as a potential future landing site. However, many of the craters in this area where frozen water sources are most likely to be found are in constant shadow, which inhibited Clementine's ability to see into these craters. These shadows are the very dark areas at the pole's center. The upcoming Lunar Reconnaissance Orbiter mission will study this area and search for evidence of frozen water sources.