In December 2010, scientists working with the Fermi telescope found two giant lobes extending from the black hole at the center of our galaxy.
Twenty-five thousand light-years high, each bubble spans more than half of the visible sky, reaching from the constellation Virgo to the constellation Grus, and may be relatively young at just a million or so years old.
The bubbles are a recent find, normally masked by the fog of gamma rays that appears throughout the sky as a result of particles moving near the speed of light interacting with light and interstellar gas in the Milky Way. Scientists only found the bubbles by manipulating the data from the telescope to draw out the striking feature.
The manipulated images show the bubbles have well-defined edges, suggesting they were formed as a result of a large and relatively rapid energy release - the source of which is still unknown. Interestingly, the energy cutoff of the bubbles corresponds to the gamma-ray line Weniger found, the one he's associating with a dark-matter signature.