Hubble Discovers that Milky Way Core Drives Wind at 2 Million Miles Per Hour

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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 miles per hour. Now, at least 2 million years later, astronomers are witnessing the aftermath of the explosion: billowing clouds of gas towering about 30,000 light-years above and below the plane of our galaxy.

via HubbleSite NewsCenter -- Latest News Releases

http://hubblesite.org/newscenter/archive/releases/2015/03/