1. The fastest known rotating black hole makes about 1000 revolutions around its axis per second.
2. According to scientists, the mass of the supermassive hole in the center of the Milky Way is 2 to 5 million masses of the Sun.
3. There is a quasar in the constellation Hounds, that is, the “seed” of the galactic core, and a supermassive hole with a mass of about 66 billion solar masses is located in it.
4. The NGC 1277 galaxy is interesting in that its supermassive central hole accounts for about 59% of the total mass.
5. An object crossing the event horizon generates sound waves, so that the “sounds” produced by a black hole can be heard. This was done for the first time in 2003.