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Watched the doco "Universe"..(BBC) a while back..in the second part.."Stars" it does mention some of the Apollo astronauts experiencing white flashes in their eyes..a study reveled that their spacecraft was bombarded with cosmic rays..charged particles moving at high speed..one part showed a electron microscope scan of a space helmut which had hundreds of hollow tubes from the cosmic rays burrowing through it!!..so I wonder how the folk in the ISS keep tabs on the cosmic rays...
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