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Where is the half of the ordinary matter in the universe not observed yet? Computer simulations of cosmological galaxy formation predict the existence of large intercluster filaments of hot and low-density gas, the so-called cosmic web. For the first time, ESA’s Planck satellite has observed one of such filaments in the merging cluster pair A399-A401; the discovery is based on the thermal Sunyaev-Zel’dovich effect. The observed temperature and baryon density are consistent with previous theoretical estimates, pointing towards a solution to the missing baryon conundrum. This new result is Part VIII of a series of 11 papers to be published by the Planck Collaboration in the scientific journal Astronomy & Astrophysics (the paper has 210 authors, 19 of which are affiliated with a Spanish institution) 1.