The Milky Way’s giant gas bubbles have been spotted in visible light

For the first time, scientists have observed visible light from the Fermi bubbles, enormous blobs of gas that sandwich the plane of the Milky Way galaxy. The newly spotted glow was emitted by hydrogen gas that was electrically charged, or ionized, within the bubbles. Astronomer Dhanesh Krishnarao of the University of Wisconsin–Madison and colleagues described the finding June 3 in a news conference at the American Astronomical Society virtual meeting and in a paper posted at arXiv.org on May 29.