This image provided by NASA-TV shows the cosmic ray detector just prior to being attached to the International Space Station Thursday May 19, 2011. The $2 billion Alpha Magnetic Spectrometer was delivered by space shuttle Endeavour. (AP Photo/NASA)

This image provided by NASA-TV shows the cosmic ray detector just prior to being attached to the International Space Station Thursday May 19, 2011. The $2 billion Alpha Magnetic Spectrometer was delivered by space shuttle Endeavour. (AP Photo/NASA)

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