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How Do We Know Black Holes Exist?
What Are Black Holes?
NASA's Chandra Finds Supermassive Black Hole Burping Nearby (Smithsonian)
"Astronomers found this outburst in the supermassive black hole centered in the small galaxy NGC 5195. This companion galaxy is merging with a large spiral galaxy NGC 5194, also known as 'The Whirlpool.' Both of these galaxies are in the Messier 51 galaxy system, located about 26 million light years from Earth."
Milky Way Has Burping Black Hole Neighbor (Discovery News)
"A supermassive black hole at the center of a neighbor galaxy apparently "burped" after swallowing up nearby matter, a phenomenon that may have been instrumental in shaping the early universe, new research shows."