It makes up about 59 percent of its host galaxy's central mass - the bulge of stars at the core. The object's closest competitor is in the galaxy NGC B, whose black hole takes up 11 percent of that galaxy's central bulge mass. NGC 's black hole could be many times more massive than its largest known competitor, which is estimated but not confirmed to be between 6 billion and 37 billion solar masses in size. Astronomers have discovered what may be the most massive black hole ever known in a small galaxy about million light-years from Earth, scientists say. However, van den Bosch's team says it has also spotted five other galaxies near NGC that look about the same, and may also harbor gigantic black holes inside of them. The team also noted that NGC has only old stars inside it. The youngest stars in the galaxy are 8 billion years old, almost twice the age of our sun.
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