Many people know the term black hole, but are not sure what a black hole exactly is.Some fear a black hole could destroy the world, while others believe that a black hole could suck in space around it. However, the reality is very different.Black holes are similar to objects in space, aside from the fact that they have a very strong gravitational force.It is important to understand that black holes will not cause the collapse of the universe. If the Sun was replaced with a black hole of equal mass, the Earth would not get sucked in. The Earth would continue orbiting the black hole, just like it orbits the Sun.At first glance, black holes appear to be sucking in matter from the universe. However, this is a mistake. Companion stars keep shedding their mass and this is in the form of stellar wind. This material present in the wind eventually comes in the vicinity of the gravitational pull of its neighboring black hole. Black holes are the strangest and most fascinating features of outer space. They are extremely dense and their strong gravitational pull even attracts light. It is believed that light is absorbed, creating fear around the concept of a black hole.Black holes were first predicted by Nobel Laureate physicist Albert Einstein in his General Theory of Relativity back in 1916. The term black hole was given much later. In 1967, American astronomer John Wheeler came up with this term. Black holes were a theory for many years and the first physical black hole was discovered in 1971. By then the properties of a black hole had been discovered.In 2019, the Event Horizon Telescope (EHT) collaboration shared with the public the first recorded image of a black hole. The EHT noticed the black hole at the center of galaxy M87. It was found when this telescope was examining the event horizon. This image successfully maps the sudden loss of photons known as particles of light, opening up a whole new world of research. People are interested in black holes now know what a black hole actually looks like.Astronomers have so far been able to identify four types of black holes. They are stellar black holes, intermediate black holes, supermassive black holes, and miniature black holes. The concept of dying stars and the creation of black holes is continually being researched.If you enjoyed this article, why not also read about the distance of the Andromeda galaxy from the Milky Way or what NASA stands for here on Kidadl?Black Hole HistoryIn 1964, the discovery of a stellar-mass black hole led to the completion of the puzzle that Einstein had started. Our understanding of the universe is constantly expanding. Scientists now know lots more about primordial black holes, how they got their name, and where they originate from. They have also discovered how a young black hole is created and all the properties of a massive black hole.Einstein did not have any solid proof of the existence of stellar-mass black holes. Black holes were just a theory in his time. A Nobel Prize was given to Roger Penrose who found the reason for the formation of a black hole and related it to the Big Bang. He also explained about a white dwarf and the first black hole was named. Before this, the term black hole had not been used.This black hole was found to be in our own Milky Way galaxy. Max Planck and Reinhard Genzel found more proof of the existence of a supermassive black hole. They gave details about its properties and reason for stability. They performed their research in Los Angeles.They came up with the theory that this supermassive black hole had so much gravity that it did not even allow light to escape. It takes decades for one such black hole to form. The first black hole could be related to the theory of general relativity that was published by Einstein.In 1939, the concept of a black hole being created due to a dying massive star was introduced by Oppenheimer and Volkoff. They showed the world through their calculations what happens when a neutron star is created. If a neutron star has too much mass, it collapses collapse under its own weight. This shall create a center point where there will be an unlimited gravitational force. This will pull in anything that passes by.They were able to explain the concept of dying massive stars and their nuclear reactions, using x-ray technology to study them. The massive weight of a neutron star could change the whole scenario. The universe holds many secrets, so when a neutron star is created with a large mass that causes it to collapse, then a black hole is created.These scientists developed explanations that for why black holes exists, how these supermassive black holes are created, and revealed many truths about the universe. As technology and calculations have advanced, studying space has become easier and scientists are learning new things about our universe everyday. The use of x-ray devices has shown us the evidence of stars and their emissions.Black Hole Meaning And FormationA cosmic body with very intense gravity is called a black hole. It is known that even light cannot escape a black hole. Black holes cannot be seen directly, but they can be observed or their presence is felt by the attraction effects of their enormous gravitational force on everything in the surrounding area, nearby stars as well.Black holes are not really black in color. It is further believed that there is an end to a black hole as well. Since a black hole has originated from a dead star, it cannot become a star again. Cosmologists are always in the search of more and more black holes. A few people also think that time stops in a black hole, however there is no evidence that supports this statement.A black hole is formed due to a cosmic body having intense gravity. A black hole is created when a massive star dies. When a star completely exhausts the thermonuclear fuels present in its core, this is called the end of the end life of a star, the point of no return. The core becomes unstable and its gravitational pull increases so much that it collapses inwards. The outer layers of the star are blown away, creating a black hole. The crushing weight of the matter falling inside compresses dying stars. There is zero volume and density becomes infinite. All this is called singularity.It can be said that black holes are formed from the remains of a large star dying in a supernova explosion. Smaller stars end up becoming dense neutron stars, or white dwarfs. These are not massive enough on their own to turn into black holes and trap light. There may not be a sufficient chain reaction, meaning new stars are formed instead.The structure of the black hole has not been fully determined, however thanks to better technology scientists now have images of black holes. All that is known is that inside the event horizon, the escape velocity exceeds the speed of light. Due to this phenomenon, even rays of light cannot escape into space.Some of the known examples of black holes are the black hole Cygnus X-1, a binary X-ray system. This consists of a blue supergiant. It also has an invisible companion with a comparable 14.8 times the mass of the Sun. Another black hole known as Sagittarius A* is a supermassive black hole. There is evidence that shows that it is present at the center of our very own Milky Way galaxy. All calculations and observations have been done from Earth thanks to advancements in technology.Theories Of Black Holes By Albert EinsteinYou may be amazed to know the Einstein did not find a black hole. He predicted facts about black holes and gave a theory.Albert Einstein’s theory of general relativity helped calculate the structure of a black hole. His theory helped when the first black hole was discovered. Inside the event horizon, the escape velocity is at such extreme speeds, exceeding the speed of light. This means rays of light cannot escape into space.Einstein had all the theoretical calculations but he was not able to prove it. Later Oppenheimer used Einstein’s calculations and further added his own to prove what Einstein had said. They received a Nobel Prize for their contributions. Einstein in fact never used the term black hole. It was coined much later when the properties were know and when scientists found that light cannot escape.Contrary to popular belief, it was Karl Schwarzschild, not Einstein who discovered black holes. Using Einstein’s equations Schwarzschild showed how black holes are formed.The idea that black holes were nothing but dark stars was first suggested by British polymath John Michell. He said they were so massive, way larger than a mountain’s mass, that they could possess a gravitational force strong enough to capture light. This is also called the point of no return. He also suggested there would be the presence of electromagnetic radiation and gravitational waves. He believed these were present in the solar system and the early universe was all a theory.What would happen if you went into a black hole?Black holes present in the Milky Way galaxy have the ability to stretch you into a long spaghetti-like strand. This has been called spaghettification.Stellar black holes are supermassive black holes. All black holes discovered so far in the milky way galaxy have high densities. They have a gravitational field larger than the Sun, so humans can be stretched.If a person ventured into a black hole, their feet would start to be stretched due to the gravitational field. It would be far greater than the Sun’s field and the person would be attracted to the center. This would make the person appear to be stretched. However, this is all a theory because no one has experienced the gravity’s pull of stellar black holes for real.Here at Kidadl, we have carefully created lots of interesting family-friendly facts for everyone to enjoy! If you liked these facts about black holes based on Einstein’s theory for kids then why not take a look at learn all about the hardy plants that live in the Atlantic Ocean , or 199939 facts: learn about what happened the year World War II started.
Many people know the term black hole, but are not sure what a black hole exactly is.
