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Crab Nebula Might Harbor the Most Powerful Electron Accelerator Ever Discovered, Scientists Found


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Physicists at the Stanford Linear Accelerator Center (SLAC) have hurled electrons into related particles with all the energy that they could master from the 1960s up until the 2000s. They have made discoveries that won three Nobel Prizes and infused electrons with energy that could reach billions of electronvolts. But now Chinese scientists have used a much powerful tool that helps discovered something in the Crab Nebula that challenges previous theories.
High in the mountains of southwest China, a colossal facility picked up two showers of particles produced by a single high-energy beam of light, which is a gamma-ray, that they believe originated from the Crab Nebula. ....

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Searching for the Universe's Most Energetic Particles, Astronomers Turn on the Radio


Scientific American
New radio-based observatories could soon detect ultrahigh-energy neutrinos, opening a new window on extreme cosmic physics
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An artist’s composite of the IceCube Neutrino Observatory in Antarctica, accompanied by a distant astrophysical source emitting neutrinos that are detected in IceCube’s subsurface sensors. Credit: IceCube and NSF
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Ever since their discovery in the 1960s, ultrahigh-energy cosmic rays have captivated scientists, who wonder where they come from. Like all cosmic rays, they are arguably misnamed: they are not “rays” of radiation but rather subatomic particles, such as protons or even entire nuclei, zipping through space. Such ultrahigh energies come from ultrahigh speeds, approaching that of light itself. ....

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