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Moon is shrinking, say astronomers[ÎÄÕ°æȨ ½ûֹתÔØ:¿¼ÊÔÓëÆÀ¼Û &=tgbvB|PJ\v&1tFroG]
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The Man in the Moon has become the latest victim of contraction in the housing market.
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Astronomers reporting on Thursday in the US journal Science said they had found previous undetected landforms which indicate that Earth's satellite has been shrinking... albeit by only a tiny amount.
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The intriguing features, called lobate scarps, are faults created when the Moon's once-molten interior began to cool, causing the lunar surface to contract and then crinkle, they said.
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Relative to the Moon's age, estimated at around 4.5 billion years, the contraction is recent, occurring less than a billion years ago, and is measured at about 100 meters (325 feet).
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Lobate scarps were first spotted near the lunar equator in the 1970s by panoramic cameras aboard the Apollo 15, 16 and 17 missions.
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Fourteen new faults have been been spotted in high-resolution images taken by NASA's Lunar Reconnaissance Orbiter.
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The new discoveries show that the scarps are globally distributed and not clustered in equatorial regions, and this provides powerful evidence for the contraction scenario.
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The investigation was headed by Thomas Watters of the Center for Earth and Planetary Studies at the Smithsonian Museum's National Air and Space Museum, Washington.
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