Astronomers using ESO’s Very Large Telescope have observed reservoirs of cool gas around some of the earliest galaxies in the Universe. Watch this video to find out why this discovery is important.The video is available in 4K UHD.The ESOcast Light is a series of short videos bringing you the wonders of the Universe in bite-sized pieces. The ESOcast Light episodes will not be replacing the standard, longer ESOcasts, but complement them with current astronomy news and images in ESO press releases.More information and download options: http://www.eso.org/public/videos/eso1921a/Subscribe to ESOcast in iTunes! https://itunes.apple.com/podcast/esocast-hd/id295471183?mt=2Receive future episodes on YouTube by pressing the Subscribe button above or follow us on Vimeo: https://vimeo.com/esoastronomyWatch more ESOcast episodes: https://www.eso.org/public/videos/archive/category/esocast/Find out how to view and contribute subtitles for the ESOcast in multiple languages, or translate this video on YouTube: https://www.eso.org/public/outreach/partnerships/translators/Credit:ESODirected by: Herbert Zodet.Editing: Herbert Zodet.Web and technical support: Gurvan Bazin and Raquel Yumi Shida.Written by: Caroline Reid and Bárbara Ferreira.Music: STAN DART (www.stan-dart.com) — Reflections.Footage and photos: ESO, Farina et al., ALMA (ESO/NAOJ/NRAO), Decarli et al., L. Calçada, M. Kornmesser, Theofanis Matsopoulos and Gianluca Lombardi (glphoto.it).Scientific consultant: Mariya Lyubenova.