Supernovae and the Galactic Ecosystem
  Supernovae are the dominant source of stellar feedback, which plays an
important role in regulating galaxy formation and evolution. While this
feedback process is still quite uncertain, it is probably not due to individual
supernova remnants as commonly observed. Most supernovae likely take place in
low-density, hot gaseous environments, such as superbubbles and galactic
bulges, and typically produce no long-lasting bright remnants. I review recent
observational and theoretical work on the impact of such supernovae on galaxy
ecosystems, particularly on hot gas in superbubbles and galactic spheroids.
