Astrophysics: Learning from Neutrinos

At Long Island's Brookhaven National Laboratory, Physicist Raymond Davis Jr. is designing one of the most extraordinary instruments known to modern science. When completed, it will be a swimming pool full of cleaning fluid, and will be installed in a deep mine to X-ray the sun.

Scientists have long been fascinated by the sun's center, where all the energy originates that supports life on earth. But the only practical way to observe this arcane spot is to study the neutrinos that are a by-product of its fierce thermonuclear reactions. The ghostly particles pay hardly any attention to matter. All except...

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