image: Artist's impression of the cosmic 'ocean' of very cold gas discovered in the heart of an embryonic cluster of galaxies, about 10 billion light-years away. A single super-galaxy is expected to condense out of this cosmic gas cloud view more
Credit: Modified from ESO Science Release 1431. Credit: ESO/M. Kornmesser. This figure is licensed under CC BY 4.0 International License (https://creativecommons.org/licenses/by/4.0/)