Milky Way blows cosmic bubbles

摘要

The Milky Way is blowing bubbles of cosmic proportions. Twin bubbles of gamma ray-emitting gas, each the size of a small galaxy, sit above and below the center of the Milky Way like the ends of a giant dumbbell, astronomers have discovered. Douglas Finkbeiner of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., and colleagues analyzed data from NASA's Fermi Gamma-ray Space Telescope to find the bubbles.