A black hole is defined by the force it would take to escape the gravitational pull of the black hole.gravitational pull exerted upon an object. Anything that wants to escape earth's gravitational pull must go at least 11 km/s, no matter what it is. The escape velocity of an object depends on how compact it is. A black hole is an area of extremely high gravity where it is impossible for even light to escape. Black holes are formed when huge amounts of matter are condensed into small spaces, such as when a colossal star dies and collapses. Also, contrary to popular drawings, black holes are invisible because not light can escape. The only way we can detect a black hole is with space telescopes that document the behavior of space material near black holes, or that study the X-Ray waves that are emitted by black holes.
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The smallest black holes are called primordial black holes, which can be as small as an atom with the mass of a large mountain. Scientists think that these black holes most likely formed near the time of the big bang. Another group of black holes are known as stellar black holes, which are categorized as medium sized (10 miles wide, with the mass over 20 times greater than our sun) and are the most commonly found type of black hole. It is theorized that dozens of this type of black hole exist in the milky way. These black holes are most likely formed when massive stars (bigger than our sun) die and collapse. Supermassive black holes are the largest type of black hole and exist in the middle of every large galaxy (such as the milky way). Supermassive black holes are about as big as our sun, but have the mass of about 4 million suns. These black holes most likely formed about the same time as the galaxy they are in the middle
The smallest black holes are called primordial black holes, which can be as small as an atom with the mass of a large mountain. Scientists think that these black holes most likely formed near the time of the big bang. Another group of black holes are known as stellar black holes, which are categorized as medium sized (10 miles wide, with the mass over 20 times greater than our sun) and are the most commonly found type of black hole. It is theorized that dozens of this type of black hole exist in the milky way. These black holes are most likely formed when massive stars (bigger than our sun) die and collapse. Supermassive black holes are the largest type of black hole and exist in the middle of every large galaxy (such as the milky way). Supermassive black holes are about as big as our sun, but have the mass of about 4 million suns. These black holes most likely formed about the same time as the galaxy they are in the middle