... Star Atlas . ... galaxies . stars . ... Intense bursts of star formation drive fierce galactic winds . ... Fierce galactic winds powered by an intense burst of star formation may blow gas right out of massive galaxies, shutting down their ability to make new stars. ... Theorists who model the evolution of galaxies often invoke supermassive black holes called active galactic nuclei, which can also generate savage winds, to explain how gas needed to form stars can be depleted. ...