what is black hole and which is the nearest black hole
Answers
Answer:
Black holes are generally defined as "a place in space where gravity pulls so much that even light cannot get out. The gravity is so strong because [the] matter has been squeezed into a tiny space." - NASA. As light is unable to escape the holes' gravity it appears completely black - hence the name.
Explanation:
There are two kinds of black holes out there: the supermassive black holes at the heart of every galaxy, and the stellar mass black holes formed when massive stars die in a supernova.
The supermassive ones are relatively straightforward. There's one at the heart of pretty much every single galaxy in the Universe. One in the middle of the Milky Way, located about 27,000 light-years away. One in Andromeda 2.5 million light years away, and so on.
No problem, they supermassive ones are really far away, no threat to us.
The stellar mass ones might be more of a problem.
Here's the problem. Black holes don't emit any radiation, they're completely invisible, so there's no easy way to see them in the sky. The only you'd know there's a black hole is if you were close enough to see the background starlight getting distorted. And if you're close enough to see that, you're already dead.
The closest black hole we know of is V616 Monocerotis, also known as V616 Mon. It's located about 3,000 light years away, and has between 9-13 times the mass of the Sun. We know it's there because it's located in a binary system with a star with about half the mass of the Sun. Only a black hole could make its binary partner buzz around so quickly. Astronomers can't see the black hole, they just know it's there by the whirling gravity dance.
The next closest black hole is the classic Cygnus X-1, which is about 6,000 light-years away. It has about 15 times the mass of the Sun, and once again, it's in a binary system.
The third closest black hole, is also in a binary system.
See the problem here? The reality is that a fraction of black holes are in binary systems, but that's our only way to detect them.
More likely there are more black holes much more close than the ones astronomers have been able to discover.
This all sounds terrifying, I'm sure, and now you've probably got one eye on the sky, watching for that telltale distortion of light from an approaching black hole. But these events are impossibly rare.
The Solar System has been around for more than 4.5 billion years, with all the planets going around and around without interruption. Even if a black hole passed the Solar System within a few dozen light years, it would have messed up the orbits significantly, and life probably wouldn't be here to consider this fact.
We didn't encounter a black hole in billions of years, and probably won't encounter one for billions or trillions more years.
Sadly, the answer to this question is… we don't know. We just don't know if the closest black holes is a few light years away, or it's actually V616 Mon. We'll probably never know.
Black hole is a region in spacetime fabric where gravity is so strong that nothing even electromagnetic radiation like light cannot escape from it . And a common misconception is that black holes are not holes they are just a region where mass is so tightly packed that we can't imagine it . It is just like compressing Earth to the size of a coin . There are three types of black holes - Stellar black holes , Intermediate black holes and Supermassive black holes. The closest black hole we know of is V616 Monocerotis, also known as V616 Mon. It's located about 3,000 light years away, and has between 9-13 times the mass of the Sun whereas the closest supermassive black holes is Sagittarius A which is the centre of milky way i.e it's gravity is so strong that the whole milky way galaxy revolves around it and it can fit between sun and mercury !!! And there is an black hole larger than the solar system itself . Hope it helps u and please mark my answer as the brainliest and please follow me