The Presidential Daily Brief


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    Astronomers Trace Cosmic Rays to Deep Space Origin

    While most neutrinos, or “ghost particles,” originate from the sun and go unnoticed due to their virtual lack of mass and electric charge, a high-energy, deep space version has long puzzled scientists. Now astronomers have finally traced one to a blazar, a huge galaxy 4 billion light-years away with a supermassive black hole at its center. The discovery solves a century-old mystery about the origin of cosmic rays, which accompany these particles, and shows the value of “multimessenger astrophysics” — using multiple types of signals to probe space.

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