... milky way . ... Hubble discovers that Milky Way core drives wind at 2 million mph . ... At a time when our earliest human ancestors had recently mastered walking upright, the heart of our Milky Way Galaxy underwent a titanic eruption, driving gases and other material outward at 2 million mph (3 million km/h). ... Although the Milky Way overall currently produces a moderate one to two stars a year, there is a high concentration of star formation close to the core of the galaxy." ... Discover | ...