About 3.5 million years ago, a Seyfert flare from Sagittarius A*, a supermassive black hole in the center of the Milky Way Galaxy, created two enormous ionization cones that sliced through our Galaxy, beginning with a relatively small diameter close to the black hole, and expanding vastly as they exited the Galaxy. An artist’s impression of the massive bursts of ionizing radiation exploding from the center of the Milky Way and impacting the Magellanic...
