"What we see are two gamma-ray-emitting bubbles that extend 25,000 light-years north and south of the galactic center," said Doug Finkbeiner, an astronomer at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., who first recognized the feature. "We don't fully understand their nature or origin."
This was detected using NASA's Fermi Gamma-ray Space Telescope.
[caption id="attachment_11856" align="aligncenter" width="600" caption="Supersized Black Hole"]
[/caption]The newly detected structure covers almost half of the sky, from the constellation Virgo to the constellation Grus, and is estimated to be millions of years old.
Doug Finkbeiner and his team of scientists evaluated publicly available data from Fermi's Large Area Telescope and found these bubbles in the sky.
Scientists still don't know exactly how these bubbles came about and are working to get a better understanding.
One of the possibilities is that there was a huge black whole in the center of our galaxy which exploded.
"In other galaxies, we see that starbursts can drive enormous gas outflows," said David Spergel, a scientist at Princeton University in New Jersey. "Whatever the energy source behind these huge bubbles may be, it is connected to many deep questions in astrophysics."
You can read more about this new structure here. For more information about Fermi, visit: http://www.nasa.gov/fermi
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