How many black holes have people discovered?

Answer 1

If you know,there lies a black hole at the center of every galaxy,so the number of galaxies in the universe,same number of black holes.But there could be trillions of galaxies,witch also means trillions of black holes.

There maybe a black hole in the center of every galaxy but there are also called stellar black holes. Stellar black holes can be find ANYWHERE in space.So it is not only the ammount of galaxies. There is a unknown answer to this question.There might be billions of black holes. Scientists do not know yet.

Since we can only see about 13 billion lightyearsof the Universe from this position, its impossible to know even an estimated number of anything in the universe. That's including black holes.

Answer 2

A very small patch of our Milky Way galaxy in the constellation Sagittarius. In total, our galaxy contains some 100 billion stars and 100 million black holes.

Any small patch of the sky shows many distant galaxies. Each probably contains a supermassive black hole and millions of stellar-mass black holes.

How many black holes are there?

There are so many black holes in the Universe that it is impossible to count them. It's like asking how many grains of sand are on the beach. Fortunately, the Universe is enormous and none of its known black holes are close enough to pose any danger to Earth.

Stellar-mass black holes form from the most massive stars when their lives end in supernova explosions. The Milky Way galaxy contains some 100 billion stars. Roughly one out of every thousand stars that form is massive enough to become a black hole. Therefore, our galaxy must harbor some 100 million stellar-mass black holes. Most of these are invisible to us, and only about a dozen have been identified. The nearest one is some 1,600 lightyears from Earth. In the region of the Universe visible from Earth, there are perhaps 100 billion galaxies. Each one has about 100 million stellar-mass black holes. And somewhere out there, a new stellar-mass black hole is born in a supernova every second.

Supermassive black holes are a million to a billion times more massive than our Sun and are found in the centers of galaxies. Most galaxies, and maybe all of them, harbor such a black hole. So in our region of the Universe, there are some 100 billion supermassive black holes. The nearest one resides in the center of our Milky Way galaxy, 28 thousand lightyears away. The most distant we know of lives in a quasar galaxy billions of lightyears away.

Answer 3

There are so many black holes they could not be individually documented. In our galaxy alone it is believed the ratio of black holes is about one to a thousand stars; so the Milky Way probably harbors 100-200 million stellar mass black holes. If other galaxies are similar, one could take the number of stars in the universe and divide by this same ratio to come up with a count. In addition, most, if not all galaxies are thought to have a central supermassive black hole, which by itself would add something around 100 billion black holes. Some recent studies indicate there may be as many as 3 x 10^23 stars in the universe; one might thus presume there would be about 300,000,000,000,000,000,000 or three hundred billion billion black holes. In addition there may be many primordial black holes resulting from initial conditions in the universe; but evidence of their existence and models which might give an approximate count are yet to be established.

Answer 4

You can't see them, but some scientists believe that there is a giant one in the center of every galaxy.

Answer 5

There is believed that there is at least 1 black hole in every galaxy, so how many galaxies were discovered? That is your answer. ;)

Answer 6

No one has directly observed a black hole, but many astronomers have made observations which support the theory that they exist.

Answer 7

Scientists expect billions of black holes in the Milky Way.

Answer 8

1,992

Answer 9

a lot...