Galaxies and Their Gas

Galaxies and Their Gas

Available on Prime Video, The Great Courses Signature Collection
S1 E20: In visible light, scientists had described galaxies as "island universes." But since the advent of radio astronomy, we've seen galaxies connected by streams of neutral hydrogen, interacting with and ripping the gasses from each other. Now astronomers have learned hat these strong environmental interactions are not a secondary feature - they are key to a galaxy's basic structure and appearance.