Imagery from a NASA spacecraft has revealed that the Moon has shrunk significantly in recent times: indeed, instruments placed by the Apollo astronauts are thought to have recorded the rumbling, crunching sounds of lunar shrinkage carrying on in just the last few decades.
The key to the business is a particular type of moon cliff known among boulder-boffins as a "lobate scarp". Pictures from NASA's selenomapping satellite, the Lunar Reconnaissance Orbiter (LRO) now in orbit around the Moon, have been trawled through and large numbers of the key scarps identified.
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