NASA wrote Cosmic Rays Hit Space Age High "According to sensors on NASA's ACE (Advanced Composition Explorer) spacecraft, galactic cosmic rays have just hit a Space Age high. 'In 2009, cosmic ray intensities have increased 19% beyond anything we've seen in the past 50 years,' says Richard Mewaldt of Caltech. 'The increase is significant, and it could mean we need to re-think how much radiation shielding astronauts take with them on deep-space missions.'"
It's actually a good article explaining a number of things. For a more english-fied version, Universe Today rewrote NASA's piece into slightly more layman's terms.
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