The most fundamental prediction of GR is the existence of black holes (BH). Black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. So for getting the answer to the question “how black holes are formed?” we should have to know about the cycle of a star in brief way from birth to the formation of a black hole. (try to imagine the whole earth compressed to a cube of less than 1 cm at each side, then you might be able to imagine the calculated conditions inside a black hole) There are some conditions by which a dying star can become a black hole, but how? They start as a small black hole and gradually grow to an enormous size, sometimes as large as a hundred million to a billion times the mass of our sun. This is the kind of black hole that’s at the center of our galaxy, the Milky Way; it’s called Sagittarius A*. The boundary of the region from which no escape is possible is called the event horizon. As the eminent American physicist Kip Thorne describes it, it is "the point where all laws of physics break down". So-called stellar black holes are the corpses of stars; when massive stars run out of fuel, they collapse in on themselves. This is because black holes themselves do not emit of reflect any light (that's why they are called black holes), and they are too small and too far away to be imaged. You can think of this type as a "million-big-star" black hole, because it contains as much matter as one million to 100 million Suns! They have masses similar to those of larger stars — about five to 20 times the mass of the sun. Beyond a certain region, not even light can escape the powerful tug of a black hole's gravity. This is the only form of light that comes from a black hole, and it’s far beyond our ability to detect. Black holes differ from each other in mass and their spin. This point of no return is called the event horizon. Two types of black holes exist. They don't live forever, but slowly evaporate returning their energy to the universe. > Q: How can we be sure that a black hole is black? Much more massive black holes are called supermassive black holes. Space exploration is complicated, dangerous, and takes a lot of patience to A: Black holes have an event horizon, inside which spacetime is so twisted that there are no light-like paths leading out of the black hole. A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. Black holes are points in space that are so dense they create deep gravity sinks. If Steven hawking discovard them,why arn't they called "Hawking holes?" For 'black holes'aren't suns (that also means, no fusion is taking place), we come back to our assumption the matter of so called black holes must be extremely solid. Small black holes are called stellar-mass black holes. xxiii) called black holes “the most perfect macroscopic objects … in the universe.” (The fact that their physical state is entirely characterized by only three numbers plays an important role in the ascription of thermodynamical properties to black holes, discussed in 5.2 below.) The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.. 91 points • 10 comments - Why are black holes called black holes. Scientists only began to speculate on the existence of black holes in the twentieth century. A black hole is an extremely dense object in space from which no light can escape. The defining property of a BH is the event horizon, a “one-way” membrane in the fabric of spacetime that defines the boundary between regions (inside and outside the BH) that are causally disconnected. Black holes are not made up of matter, although they have a large mass. Although astronomers haven't yet proven they exist, primordial black holes could answer some of the current outstanding questions in astronomy, including the nature of dark matter. They may also not have "event horizons" beyond which there is no return. In the center of a black hole is a gravitational singularity, a one-dimensional point which contains a huge mass in an infinitely small space, where density and gravity become infinite and space-time curves infinitely, and where the laws of physics as we know them cease to operate. Black holes formed by the collapse of individual stars are relatively small, but incredibly dense. It can be formed by the death of a massive star wherein its core gravitationally collapses inward upon itself, compressing to a point of zero volume and infinite density called the singularity. It was discovered more than 40 years ago. One of these objects packs more than three times the mass of the sun into the diameter of a city. It was called Cygnus X-1, an x-ray source in the constellation Cygnus. Black holes may solve some of the mysteries of the universe. As nothing can escape a black hole — not visible light, X-rays, infrared light, microwaves or any other form of radiation — black holes are invisible. Conclusion I think there is still more questions to be answered about black holes because there is really not enough information about the inside of a black hole and a actually recording of a black hole. The center of a black hole, where all its mass resides, is a point called a singularity. ... which is why they're called black holes. A black hole is a region of space from which nothing can escape. But a "Black Hole" is the very antithesis of that - a collapsed star, the most intense "something" imaginable, surrounded by "nothing". A German physicist and astronomer named Karl Schwarzschild proposed the modern version of a black hole … Supermassive black holes are the largest type of black hole. Not even light can break free, hence the name 'black' hole. There are images of binary star systems consisting of one normal star and one black hole, and of the central regions of galaxies that are believed to contain black holes. In fact, a supermassive black hole called Sagittarius A* holds together our galaxy. Another kind of black hole is called a supermassive black hole. [A] True [B] False If a space probe could be sent into a black hole, it … October 25, 2017. in Remote sensing, Research, Space. Black holes were first proposed to exist in the 18th century, but remained a mathematical curiosity until the first candidate black hole was found in 1964. Black holes can have the mass of several million suns. These are thought to start by "swallowing" other stars at the center of a galaxy. As far as we can observe them, black holes are both completely black and also completely dark. A hole in the theory. Fun Facts about black holes. Why there’s supermassive black hole at the center of the Milky Way. The German physicist Karl Schwarzschild was the first to "discover" black holes. They’re up to one million times more massive than our sun. A black hole takes up zero space, but does have mass — originally, most of the mass that used to be a star. Black holes do not exist—at least, not as we know them, Stephen Hawking says. While black holes are mysterious and exotic, they are also a key consequence of how gravity works: When a lot of mass gets compressed into a small enough space, the resulting object rips the very fabric of space and time, becoming what is called a singularity. As I understand it, any "hole" has to be "in" something, and is therefore "nothing surrounded by something". If you got too close to a black hole, it would suck you in and you'd never be able to escape, even if you were travelling at the speed of light. Gravity from stellar-mass black hole IGR J17091 is pulling gas away from a companion star. How quickly a black hole evaporates depends on its mass: the less massive a black hole, the more quickly it evaporates. It cannot therefore be gone "through", but only "onto", and then, because of its intense gravitational pull, escape is impossible, even for light. Black holes form during the death of massive stars, but not always. Black holes are volumes of space where gravity is extreme enough to prevent the escape of even the fastest moving particles. or "Black hawkings? But black holes evaporate through a process called Hawking Radiation. Astronomers think that supermassive black holes are lurking at the centers of galaxies, including our own Milky Way galaxy. According to the general theory of relativity, it is the result of the curving of spacetime caused by a huge mass.Around a black hole there is a position of no return, called the event horizon.It is called "black" because it absorbs all the light that hits it, reflecting nothing, just like a perfect black body in thermodynamics. A black hole is a place in space where gravity pulls so much that even light cannot get out. The sun would need to be about 20 times more massive to end its life as a black hole. Black Holes. by Tibi Puiu.
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