HubbleSite: Black Holes: Gravity's Relentless Pull interactive: About This Site: Encyclopedia

There are so many black holes in the universe that you can not calculate them. It is like asking the amount of sand on the beach. Fortunately, the universe is huge and its known black hole is not enough to bring the danger to the earth.

When their lives end with a supernova explosion, the stellar mass black holes are formed from the largest mass of stars. The Milky Way contains about 100 billion stars. One in 1000 stars and one in one star will form a sufficiently large black hole. Therefore, in our Milky Way, we need to have about 100 million black holes of fixed star mass. Most of them do not look to us, and only a dozen have been found. About 1600 light years from Earth. There may be 100 billion galaxies in the universe area visible from the earth. Everyone has about 100 million black hole with fixed star mass. Somewhere in there, a new stellar mass black hole is born on supernova per second.

The mass of the super mass black hole is one million to one billion times that of the sun, which is in the center of the galaxy. Most galaxies, perhaps the galaxies, have such black holes. So in our universe we have about 100 billion super mass black holes. The closest thing is in the center of our Milky Way, 28,000 light years away. We know that the farthest Quasar star has a light factor of one billion years

According to the Hubble site, there is a balance between gravity and pressure push in the normal life of the star. When the star runs out of nuclear fuel, gravity will take over and eventually turn stars into black holes. Now I can not completely identify the cause, but whenever I think about my first experience on the Internet, I think about this exact picture - a black hole is formed. I remember how annoying it was to wait for his conference to be over at the father 's workplace more than ten years ago. I fell down in his chair to play and produce stories in my mind. The only thing I can do is turning and turning until I get dizzy. I like to use the sound of a gun to blow away the sound of life, so I will someday play with a typewriter (I realized that this is actually wasting the perfect paper.

Quantifying the material field in the background of the black hole, I found a lot about the black holes. However, to understand the basic principle of black hole thermodynamics, quantum gravity theory is necessary. Quantum theory is also necessary to tell us what happens near the singular point. However, it is very difficult to quantify gravity. In particular, to understand the black hole, the theory that gives some hope is string theory.

Black holes are greatly increased by capturing nearby materials. Everything that falls within the scope of the event can not escape from the gravity of the black hole. Despite its fame, the black hole actually does not inhale objects from afar. Black holes can only capture objects that are very close to them, or objects that are moving toward them. The black hole consists mainly of gas and dust, filling the space of the entire space of the universe. The black hole also consumes substances from nearby stars. Black holes may grow by fusing with other black holes and then fusing them, then they become super mass black holes.