Astronomers identify source of neutrinos, a step toward resolving a century-old riddle
(World News Science)

An international team of scientists has found the first evidence of a source of high-energy cosmic neutrinos - ghostly subatomic particles that can travel unhindered for billions of light-years from the most extreme environments in the universe to Earth. The observations are a step toward resolving a century-old riddle about what sends subatomic particles such as neutrinos and cosmic rays speeding through the universe. Cosmic rays are charged particles whose paths cannot be traced directly back to their sources due to the powerful magnetic fields that fill space and warp their trajectories. But the powerful cosmic accelerators that produce them also produce neutrinos, which are uncharged...