Supernovas A very large star explodes, somewhere in the unfathomable space of our galaxy. The star's core collapses. The monstrous pressure crushes its atoms and smashes their electrons into the nuclei. There, the negatively charged protons change to neutrons and neutrinos. Billions of neutrinos particles, that have no electrical charge and little or no mass, escape through the star's outer shell into space. Traveling at nearly the speed of light, they penetrate clouds, reach Earth, and pass harmlessly through the bodies of millions of people and everything else in their ways. A Supernova such as this occurs about once every 30 years in any one galaxy. At some time in their long lives, the supernova-spawned neutrinos of 20 million electron voltes or less interact with matter. These neutrinos include low ener....

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