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.
No. Most black holes form when an extremely massive star dies and the core collapses, becoming a black hole.
if two black holes collide, they swallow eachother making one giant blackhole
most likely in a long time but scientist are detecting black holes coming closer to earth.
Yes, many galaxies have supermassive black holes at their centers.
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.
It is known what will happen. You will get sucked up! But before you get sucked up, Black Holes give flicker of black hot gas. Black Holes have so much power that they can't control it. So that's why they suck up everything in their path. Fun Fact: Black Holes are actually stars that died and contain so much power!!
Yes, black holes are known and regarded by many scientists, astronomers, and physicists.
The milky way contains about a dozen black holes in the milky way.
It would emit a lot of radiation. Some distant black holes (or more accurately, the area around the black holes) emit more radiation than an entire galaxy. Such black holes are known as quasars.
While we have never actually proven that this does happen, we're fairly certain that when two black holes get close enough together, they will merge and form one even larger black hole.
Black holes are hidden behind an even horizon we do not know what happen in side them.
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).