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题目材料：
In 1999, the Lunar Prospector space probe found a marked deficit of medium-energy neutrons each time it flew over the Moon's north and south poles, indicating that there is a relative abundance of hydrogen in the Moon's upper soil layers there. This was a tantalizing finding, because hydrogen is a component of water, and researchers have long speculated that water in the form of ice could exist within cold nooks on the Moon's surface where the Sun never penetrates: steep crater walls near the lunar poles could shade the soil for billions of years. But ice is not the only way to explain the neutron data. The solar wind blasts the Moon's surface with torrents of hydrogen, and some of this builds up in the soil. However, astronomer Bill Feldman believes that ice is the better explanation: hydrogen is 30 times more abundant at the cold poles than elsewhere on the surface, and Prospector's peak detections of hydrogen match areas of permanent shadow seen by Clementine, a spacecraft that orbited the Moon in 1994.
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