The number is not known as most would be undetectable with current technology. They likely number in the millions.
Not every galaxy has a black hole at its center. While many galaxies do have supermassive black holes at their centers, there are also galaxies that do not have black holes.
Black holes are a bit hard to detect, so I am pretty sure that not all black holes in this galaxy are known - and I suspect there is not even a decent estimate. But you can expect there to be several.
Not every galaxy has a black hole at its center, but many galaxies, including our own Milky Way, do have supermassive black holes at their centers.
Not all galaxies have black holes. While many galaxies, including our own Milky Way, have supermassive black holes at their centers, there are also galaxies that do not have black holes. The presence of a black hole in a galaxy depends on various factors such as the size and age of the galaxy.
Not really "a" black hole - many black holes. It is currently believed that all, or most, galaxies have a huge black hole at its center. Any galaxy should also have lots of smaller black holes - so-called "stellar" black holes, because they have approximately the mass of a star (larger stars can become black holes).
Black holes are not present in the center of every galaxy, but many galaxies, including our own Milky Way, have a supermassive black hole at their center. These black holes have a gravitational pull so strong that not even light can escape from them.
Yes. Our galaxy has a supermassive black hole at its center and likely millions of stellar mass black holes scattered throughout.
Yes. There is a supermassive black hole at the center of the galaxy and a number of stellar mass black holes through the rest of it.
Yes, Black Holes are very common in our galaxy and general.
Yes
Black holes can technically be any where. Some scientists believe that there is a black hole in the center of our galaxy along with many other galaxies. Because black holes are so difficult to detect, they can be very dangerous.
There are many black holes in the universe, and they are generally in the very center of a galaxy. Our Galaxy, the Milky Way, has one big black hole in the centre of it.