As many people that looked up this question :)
No. The nearest known black holes are many light-years away. Everything we know - everything we THINK we know - about black holes is theoretical. Guesswork.
Professor Stephen Hawking knows a bunch of facts about black holes. The count would be too difficult to quantify and probably not as interesting as the information itself.
The milky way contains about a dozen black holes in the milky way.
He not only became an expert in black holes, but he has now written a book called A short history of time, telling us many things we don't know about time.
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.
No one will know for a long time. We know of some, but not all.
No. The nearest known black holes are many light-years away. Everything we know - everything we THINK we know - about black holes is theoretical. Guesswork.
Whoever said this seems to think that there is not enough direct evidence for black holes. However, I understand there is enough evidence to believe that black holes actually exist - including the observation of many, many objects that can only be black holes.
Yes, black holes are known and regarded by many scientists, astronomers, and physicists.
Professor Stephen Hawking knows a bunch of facts about black holes. The count would be too difficult to quantify and probably not as interesting as the information itself.
It is not known how many black holes exist. One of the main reasons is that, if matter is not actually falling into the black hole, it is impossible to detect.
The milky way contains about a dozen black holes in the milky way.
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).
He not only became an expert in black holes, but he has now written a book called A short history of time, telling us many things we don't know about time.
a lot of people for all i know
Black holes emit so very little radiation they are hard to see. Many black holes lie at the center of galaxies and there they are hidden by stars and dust.
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.