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Supermassive black hole - Wikipedia
supermassive black holes –
Black Holes and Revelations - Wikipedia
What is the closest star to the Milky Way's central black hole (not Sagittarius A)? How far away is that star from the black hole? - Quora
Are there any planets that orbit around Sagittarius A* (the super massive blackhole in the center of the Milky Way)? If so, how do they survive being pulled into it? - Quora
Supermassive black hole - Wikipedia
Primordial black hole - Wikipedia
Massive Black Hole – Telegraph
Intermediate massed black hole - Simple English Wikipedia, the free encyclopedia