Fermi bubbles are made up of gamma rays, but where they came from is still up for debate. Did they come from a star-forming region, or the black hole at the middle of our galaxy?
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Sources:
https://arstechnica.com/science/2013/01/star-formation-drives-huge-bubbles-in-the-milky-way/
https://www.nasa.gov/mission_pages/GLAST/news/new-structure.html
https://news.nationalgeographic.com/news/2010/03/100303-gamma-ray-fog-fermi-dragons/
https://arstechnica.com/science/2017/09/highest-energy-cosmic-rays-bounce-off-bubble-irradiate-earth/
http://www.skyandtelescope.com/astronomy-resources/understanding-fermi-bubbles/
http://astronomy.com/news/2017/03/fermi-bubbles
http://hubblesite.org/news_release/news/2017-10
Images:
https://svs.gsfc.nasa.gov/12313
https://www.nasa.gov/mission_pages/GLAST/news/new-structure.html
https://svs.gsfc.nasa.gov/20142
https://svs.gsfc.nasa.gov/30682
https://svs.gsfc.nasa.gov/30796
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