NASA's Fermi Gamma-ray Space Telescope detected gamma rays from TXS 0506+056, shown here as expanding circles. Their maximum size, color -- from white (low) to magenta (high) -- and associated tone indicate the energy of each ray. The first sequence shows typical emission; the second shows the 2017 flare leading to the neutrino detection.

Credit: NASA/DOE/Fermi LAT Collab., Matt Russo and Andrew Santaguida/SYSTEM Sounds

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