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Blowing Bubbles
Featured on July 20, 2015
Giant bubbles of hot gas erupt from the core of the Milky Way galaxy in this artist's concept. The galaxy's thin disk is shown edge-on, with the bubbles billowing thousands of light-years into intergalactic space. Known as Fermi bubbles for their discovery by the Fermi space telescope, they may have been created by eruptions in a disk of gas close to the galaxy's central black hole. The bubbles are visible only to space telescopes that are sensitive to gamma rays and X-rays. [NASA/GSFC]