A supermassive black hole in the center of the Milky Way just woke up and is flashing 75 times brighter than ever observed, after being quiet for more than 20 years, baffling astronomers. Sagittarius A*, a supermassive blackhole that weighs about 4 million solar masses, is normally low key with minimal fluctuation in brightness. Recently, however, it bloomed 75 times brighter than ever before for...