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It was really a personal decision on my part. I'm 60 years old and there's lots of things I want to do with my life
Pittsburgh mayor rules out fourth term Dec 22, 2004
Near full moon, the strength of the returning light decreases by a factor of 10
Study: Moon reflectors may be dusty Apr 21, 2010
The best signal we've seen from Lunokhod 2 in several years of effort is 750 return photons, but we got about 2,000 photons from Lunokhod 1 on our first try
Researchers track lost lunar probe Apr 27, 2010