This text includes a full discussion of the circumgalactic medium, which bridges the space between the interstellar and intergalactic gas, and the hot intracluster gas that fills clusters of galaxies.
Since most of the visible matter in the universe --- stars, hot gas in clusters of galaxies, and various phases of the interstellar medium inside galaxies ... to magnetar flares and gamma-ray bursts.
"The possibility of interstellar quantum communication is intriguing because it expands the notion of interstellar ...