On scales larger than tens of millions light years, the Universe is self-organised by gravity into a spiderweb pattern filled by normal and dark matter: “The Cosmic Web.” While the distribution of galaxies tracing the shape of the Web has been observed for decades in optical and infrared wavelengths, no direct detection of its dominant mass component – the gas – has been possible so far. This leaves a long-standing puzzle in astrophysics still open: where has a large fraction of the normal matter in the Universe gone?

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