Compared to other galaxies, the Milky Way is a peaceful place. But it hasn't always been so sleepy. In 2010, a team of scientists working at the Harvard-Smithsonian Center for Astrophysics discovered a pair of "Fermi bubbles" extending tens of thousands of light-years above and below the Milky Way's disk. From end to end, the newly discovered gamma-ray bubbles (magenta) extend 50,000 light-years, or roughly half of the Milky Way's diameter.
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