NASA's Fermi spacecraft has discovered a pair of enormous gamma-ray-emitting bubbles extending from the Milky Way's center. Although not apparent in an all-sky gamma-ray map
(upper panel), the dumbbell-shaped feature became evident after removing other sources
(lower panel).
The bubbles extend 50° north and south from the galactic plane, spanning the sky from Virgo to Grus.
http://www.skyandtelescope.com/commu...166437566.html