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Joan M. Engel

Joan Marcella (Butler) Engel, age 96 of Frazee, Minnesota passed away Monday, March 21 at Sanford Health, Fargo, ND surrounded by her loving family. ....

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In Memoriam: Thomas K. Gaisser

Colleagues remember renowned astroparticle physicist, Antarctic researcher ....

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High-Energy Cosmic Ray Sources Get Mapped Out for the First Time

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In the 1930s, the French physicist Pierre Auger placed Geiger counters along a ridge in the Alps and observed that they would sometimes spontaneously click at the same time, even when they were up to 300 meters apart. He knew that the coincident clicks came from cosmic rays, charged particles from space that bang into air molecules in the sky, triggering particle showers that rain down to the ground. But Auger realized that for cosmic rays to trigger the kind of enormous showers he was seeing, they must carry fantastical amounts of energy so much, he wrote in 1939, that “it is actually impossible to imagine a single process able to give to a particle such an energy.” ....

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