Deep observations made with the MUSE spectrograph on ESO's Very Large Telescope have uncovered vast cosmic reservoirs of atomic hydrogen surrounding distant galaxies. The exquisite sensitivity of MUSE allowed for direct observations of dim clouds of hydrogen glowing with Lyman-alpha emission in the early Universe — revealing that almost the whole night sky is invisibly aglow. The release, images and videos are available on: https://www.eso.org/public/news/eso1832/ Kind regards, The ESO Education and Public Outreach Department 1 October 2018 | Xavier Barcons 28 September 2018: Greetings and welcome once more to the ESOblog! | | | | |