Author: CERN Courier
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The March/April 2026 issue of the CERN Courier is out (Copy)
Most of the universe is void. Of the rest, most is invisible. Yet it weaves a sprawling cosmic web, lit at its nodes by clusters of galaxies. Stack many cluster pairs and a faint radio glow appears between, brighter than diffuse intergalactic gas alone can account for. Theorist Elena Pinetti explains how the excess may