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How could water exist on the Moon?The Moon’s axis tilts only 1.5 degrees from the ecliptic plane (theplane containing the path of the Earth and the Moon around the Sun).Because of this unique geometry, sunlight never shines on the floors ofsome craters near the Moon’s poles (figure 1). These areas are knownas Permanently Shadowed Regions, or PSRs. Water that happensto find its way into PSRs may remain there for long periods of time.Data from the Diviner instrument on board LRO, which measurestemperatures across the Moon, including PSRs, indicate that somesurfaces are cold enough so that water is stable at the surface.