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"Up until now, if you wanted to test some theories about the Moon, its distance, or deviations from general relativity, you would have to shoot a laser from Earth to a group of old, dusty and imprecise reflectors from the Apollo era, which sit on the surface the big cheese -- but that might all be changing. NASA announced recently that it's funding development of a moon-based laser system, which would answer the laser bursts from Earth with its own, thus cutting down on fluctuations in readings and allowing for a more accurate study of the Moon's distance. Because there's no better way to spend several million dollars than sending a laser up to the moon to clarify a few millimeters of uncertainty."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/06/25/life-imitates-art-moon-to-be-equipped-with-frickin-lasers/>