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...smaller stars in this galaxy). But this theory could not account for rays whose energy is above a critical limit. The galaxy's overall magnetic field can make fairly powerful rays curve enough to stay inside it, but if the rays acquire more than about 1018 (11billion billion) electron volts, the galactic field cannot hold them. Such rays will shoot off and be lost in intergalactic space. So cosmic-ray experts reason that if rays hit the earth with more than 1018 electron volts, they must come from some unknown accelerating force that works outside the galaxy...
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