http://www.sci-news.com/astronomy/pristine-gas-cloud-06734.htmlAccording to a Swinburne University of Technology-led study, the newly-discovered relic cloud of gas is unpolluted by stars even 1.5 billion years after the Big Bang.

Simulation of galaxies and gas in the Universe: within the gas in the (blue) filaments connecting the (orange) galaxies lurk rare pockets of pristine gas. Image credit: TNG Collaboration.