Milky Way’s Giant Black Hole Awoke from Slumber 300 Years Ago
http://www.nasa.gov/centers/goddard/...e_slumber.html
"By observing how this cloud lit up and faded over 10 years, we could trace back the black hole’s activity 300 years ago," says team member Katsuji Koyama of Kyoto University. "The black hole was a million times brighter three centuries ago. It must have unleashed an incredibly powerful flare."