A nearby supernova in 2023 offered astrophysicists an excellent opportunity to test ideas about how these types of explosions boost particles, called cosmic rays, to near light-speed. But surprisingly, NASA's Fermi Gamma-ray Space Telescope detected none of the high-energy gamma-ray light those particles should produce.
NASA's Fermi mission sees no gamma rays from nearby supernova retrieved 16 April 2024 from https://phys.org/news/2024-04-nasa-fermi-mission-gamma-rays.html
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