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The discovery of a new radio relic+halo system: the largest particle accelerators of the universe Galaxies are grouped in large, massive clusters which undergo repeated mergers during their lifetime. As a consequence of these mergers, shock waves larger than millions of light years and turbulence develop in the gas which permeates the cluster. These phenomena accelerate particles like giant cosmological particle accelerators to the level that they shine in the radio band creating the so called radio relics (originated by shock waves) and radio halos (originated by turbulence). Using the Giant Meterwave Radio Telescope and the Westerbork Radio Synthesis Telescopes our group discovered a new spectacular example of double radio relic + radio...