Caltech astronomers have taken unprecedented images of the intergalactic medium (IGM) — the diffuse gas that connects galaxies throughout the universe — with the Cosmic Web Imager, an instrument designed and built at Caltech. Until now, the structure of the IGM has mostly been a matter for theoretical speculation. However, ...
Read More »The intergalactic medium unveiled: Cosmic Web Imager directly observes ‘dim matter’
