essay in english black hole

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1 (page 1) p. 1 What is a black hole?

Published: December 2015
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A black hole is a region of space where the force of gravity is so strong that nothing, not even light, can travel fast enough to escape from its interior. ‘What is a black hole?’ outlines how they were first conceived by theoretical physicists such as John Michell, Henry Cavendish, Pierre-Simon Laplace, and Albert Einstein, and explains the concepts of singularity, escape velocity, the event horizon, and spacetime. Black holes have now been identified in the Universe in their hundreds and accounted for in their millions. Although invisible, these objects interact with and influence their surroundings in different ways depending on proximity relative to the black hole.

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Essay on Black Holes

Students are often asked to write an essay on Black Holes in their schools and colleges. And if you’re also looking for the same, we have created 100-word, 250-word, and 500-word essays on the topic.

Let’s take a look…

100 Words Essay on Black Holes

Introduction to black holes.

Black Holes are places in space where gravity is so strong that nothing, not even light, can escape from it. Imagine a star ten times more massive than the Sun squeezed into a sphere approximately the diameter of New York City. The result is a gravitational field so strong that nothing can escape from it.

Formation of Black Holes

Black holes are formed from the remnants of large stars. When such a star has burned out its fuel, it explodes into a supernova. What’s left collapses under its own gravity, forming a black hole.

The Event Horizon

The edge of a black hole is called the event horizon. If anything crosses this line, it can’t get back out again because the gravitational pull is too strong. It’s like the ultimate one-way street – once you go in, you can’t come out.

Types of Black Holes

There are three types of black holes: stellar, supermassive, and intermediate. Stellar black holes are small but incredibly dense. Supermassive black holes are found at the center of galaxies, including our own Milky Way. Intermediate black holes are in between the other two in terms of size.

Black Holes and Space-Time

Black holes warp space-time, which is a way to think about the fabric of the universe. Space-time is like a trampoline. If you put something heavy on it, it sinks. That’s what a black hole does – it makes a deep hole in space-time.

250 Words Essay on Black Holes

What are black holes.

Black holes are fascinating objects in space. They are areas where gravity is so strong, that nothing can escape from it, not even light. This is why we call them “black” holes. They are like giant space vacuums that suck in everything close enough to them.

How are Black Holes Formed?

Black holes are formed when a big star dies. This happens in a huge explosion called a supernova. After the explosion, what’s left of the star collapses in on itself because of gravity, creating a black hole. It’s like squishing a giant star into a tiny spot.

There are three types of black holes. The smallest ones are called ‘Stellar’. They are up to 20 times bigger than the sun. The medium ones are ‘Intermediate’ black holes. The biggest ones are ‘Supermassive’ black holes. They are millions or even billions of times bigger than the sun. Scientists believe there is a supermassive black hole at the center of every galaxy, including ours.

Can We See Black Holes?

We can’t see black holes directly because they don’t let light out. But we can see how they affect things around them. For example, if a black hole is pulling on a star, the star might move in a weird way. Or, if a black hole is eating up material from around it, that material might glow very brightly. So, we can find black holes by looking for these signs.

Black holes are one of the most exciting mysteries in space. Even though they are scary to think about, they are also very interesting, and scientists are always trying to learn more about them.

500 Words Essay on Black Holes

Black holes are a fascinating part of our universe. They are places where gravity is so strong that nothing can escape, not even light. This is why we call them “black” holes. It’s like they have swallowed up everything around them. They are formed when a large star runs out of fuel and collapses under its own weight.

Stars are like giant factories that make light and heat by burning hydrogen fuel in a process called nuclear fusion. But when a star has used up all its fuel, it can’t hold itself up anymore. The star’s outer layers explode out into space in a brilliant event called a supernova. What’s left collapses inwards, and if the star was big enough, it becomes a black hole.

What’s Inside a Black Hole?

What’s inside a black hole is a mystery. Because no light can get out, we can’t see what’s happening inside. Some scientists think that at the very center of a black hole is a point called a singularity, where gravity is infinitely strong and space and time stop making sense. But we don’t really know for sure.

How do We Know Black Holes Exist?

Even though we can’t see black holes, we can find them by looking at the things around them. For example, if a star is moving in a strange way, it might be because there’s a black hole nearby. The black hole’s strong gravity is pulling on the star. We can also find black holes by looking for powerful jets of energy and matter shooting out from around them.

Are Black Holes Dangerous?

Black holes sound scary, but they’re not really a danger to us. They’re very far away and their gravity only affects things that are very close to them. So, even though black holes are amazing and a little bit scary, we don’t need to worry about them swallowing up our planet.

Black Holes and Science Fiction

Black holes are often featured in science fiction stories. They’re used as gateways to other universes, time machines, or even superweapons. But in real life, black holes are not like this. They’re just a part of the universe, like stars and galaxies.

In conclusion, black holes are one of the most intriguing and mysterious phenomena in the universe. They are formed from the remnants of massive stars and have such strong gravity that nothing can escape from them. Despite their portrayal in science fiction, black holes are not a threat to Earth, but rather distant and fascinating objects of scientific study.

That’s it! I hope the essay helped you.

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Black Holes

Black holes are some of the most fascinating and mind-bending objects in the cosmos. The very thing that characterizes a black hole also makes it hard to study: its intense gravity. All the mass in a black hole is concentrated in a tiny region, surrounded by a boundary called the “event horizon”. Nothing that crosses that boundary can return to the outside universe, not even light. A black hole itself is invisible.

But astronomers can still observe black holes indirectly by the way their gravity affects stars and pulls matter into orbit. As gas flows around a black hole, it heats up, paradoxically making these invisible objects into some of the brightest things in the entire universe. As a result, we can see some black holes from billions of light-years away. For one large black hole in a nearby galaxy, astronomers even managed to see a ring of light around the event horizon, using a globe-spanning array of powerful telescopes.

Center for Astrophysics | Harvard & Smithsonian scientists participate in many black hole-related projects:

Using the Event Horizon Telescope (EHT) to capture the first image of a black hole’s “shadow”: the absence of light that marks where the event horizon is located. The EHT is composed of many telescopes working together to create one Earth-sized observatory , all monitoring the supermassive black hole at the center of the galaxy M87, leading to the first image ever captured of a black hole. CfA Plays Central Role In Capturing Landmark Black Hole Image

Observing supermassive black holes in other galaxies to understand how they evolve and shape their host galaxies. CfA astronomers use telescopes across the entire spectrum of light, from radio waves to X-rays to gamma rays. A Surprising Blazar Connection Revealed

Studying the infall of matter — called “accretion” — onto black holes, using NASA’s Chandra X-ray Observatory and other telescopes. In addition, CfA researchers use cutting-edge supercomputers to create theoretical models for the disks and jets of matter that black holes create around themselves. Supermassive Black Hole Spins Super-Fast

Hunting for black hole interactions with other astronomical objects. That includes “disruption” events, where black holes tear stars or other objects apart, creating bursts of intense light. Black Hole Meal Sets Record for Length and Size

Observing clusters of stars to find intermediate mass black holes, and modeling how they shape their environments. A Middleweight Black Hole is Hiding at the Center of a Giant Star Cluster

Hunting for and characterizing stellar mass black holes, which can include information about their birth process and evolution. NASA's Chandra Adds to Black Hole Birth Announcement

The Varieties of Black Holes

Black holes come in three categories:

Stellar Mass Black Holes are born from the death of stars much more massive than the Sun. When some of these stars run out of the nuclear fuel that makes them shine, their cores collapse into black holes under their own gravity. Other stellar mass black holes form from the collision of neutron stars , such as the ones first detected by LIGO and Virgo in 2017. These are probably the most common black holes in the cosmos, but are hard to detect unless they have an ordinary star for a companion. When that happens, the black hole can strip material from the star, causing the gas to heat up and glow brightly in X-rays.

Supermassive Black Holes are the monsters of the universe, living at the centers of nearly every galaxy. They range in mass from 100,000 to billions of times the mass of the Sun, far too massive to be born from a single star. The Milky Way’s black hole is about 4 million times the Sun’s mass, putting it in the middle of the pack. In the form of quasars and other “active” galaxies , these black holes can shine brightly enough to be seen from billions of light-years away. Understanding when these black holes formed and how they grow is a major area of research. Center for Astrophysics | Harvard & Smithsonian scientists are part of the Event Horizon Telescope (EHT) collaboration, which captured the first-ever image of the black hole: the supermassive black hole at the center of the galaxy M87.

Intermediate Mass Black Holes are the most mysterious, since we’ve hardly seen any of them yet. They weigh 100 to 10,000 times the mass of the Sun, putting them between stellar and supermassive black holes. We don’t know exactly how many of these are, and like supermassive black holes, we don’t fully understand how they’re born or grow. However, studying them could tell us a lot about how the most supermassive black holes came to be.

Black holes can seem bizarre and incomprehensible, but in truth they’re remarkably understandable. Despite not being able to see black holes directly, we know quite a bit about them. They are …

Simple . All three black hole types can be described by just two observable quantities: their mass and how fast they spin. That’s much simpler than a star, for example, which in addition to mass is a product of its unique history and evolution , including its chemical makeup. Mass and spin tell us everything we need to know about a black hole: it “forgets” everything that went into making it. Those two quantities determine how big the event horizon is, and the way gravity affects any matter falling onto the black hole.

Compact . Black holes are tiny compared to their mass. The event horizon of a black hole the mass of the Sun would be no more than 6 kilometers across, and the faster it spins, the smaller that size is. Even a supermassive black hole would fit easily inside our Solar System.

Powerful . The combination of large mass and small size results in very strong gravity. This gravity is strong enough to pull a star apart if it gets too close, producing powerful bursts of light. A supermassive black hole heats gas falling onto it to temperatures of millions of degrees, making it glow brightly enough in X-rays and other types of radiation to be seen across the universe.

Very common . From theoretical calculations based on observations, astronomers think the Milky Way might have as many as a hundred million black holes, most of which are stellar mass. And with at least one supermassive black hole in most galaxies, there could be hundreds of billions of supermassive black holes in the observable universe.

Very important . Black holes have a reputation for eating everything that comes by, but they turn out to be messy eaters. A lot of stuff that falls toward a black hole gets jetted away, thanks to the complicated churning of gas near the event horizon. These jets and outflows of gas called “winds” spread atoms throughout the galaxy, and can either boost or throttle the birth of new stars, depending on other factors. That means supermassive black holes play an important role in the life of galaxies, even far beyond the black hole’s gravitational pull.

And yes, mysterious . Along with astronomers, physicists are interested in black holes because they’re a laboratory for “quantum gravity”. Black holes are described by Albert Einstein’s general relativity, which is our modern theory of gravity, but the other forces of nature are described by quantum physics. So far, nobody has developed a complete quantum gravity theory, but we already know black holes will be an important test of any proposed theory.

The first image of a black hole in human history, captured by the Event Horizon Telescope, showing light emitted by matter as it swirls under the influence of intense gravity. This black hole is 6.5 billion times the mass of the Sun and resides at the center of the galaxy M87.

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Generally speaking, a black hole is a space object possessing extreme density; its mass is so enormous, and the respective gravitational attraction is so powerful, that even light cannot escape its trap. This is why they are called ‘black holes’—you cannot see them without special devices, since there is no light in the point where a black hole is. The first person to have predicted this phenomena was Albert Einstein, and the term ‘black hole’ appeared in 1967, introduced by the American astronomer John Wheeler. But, only in 1971 was the first black hole discovered (Space.com).

But how do black holes appear? Science offers us the following explanation: when a large star burns the last of its ‘fuel,’ it may start collapsing under its own mass , falling in on itself until it shrinks to an object much smaller than the original star, but with the same mass—the stellar black hole ( Space.com ).

No one knows exactly what is going on inside black holes. A popular science-fiction topic (raised in the recent film ‘Interstellar,’ for example) refers to what happens if somebody falls into a black hole. Some believe black holes to be the predicted wormholes to other parts of the Universe. Others make less fantastic suggestions. Either way, what is truly amazing about black holes is how they distort time and space. If a person ‘falls’ into a black hole, for an outsider, the movement of this person will be slowing down, unless it finally freezes ( universetoday.com ). Moreover, according to Stephen Hawking, the incredible gravity of a black hole will be endlessly stretching this person in length. However, for the person ‘falling’ into a black hole, time will seem to pass as usual—and, respectively, this person will not notice any spacial distortions either.

Another popular question is, “What happens if a black hole gets too close to Earth?” Black holes do not move around space. Nothing bad will happen to Earth, because no black hole is close enough to the solar system to consume our planet. However, if theoretically a black hole, possessing the same mass as the sun, took its place, nothing would happen anyways. The same mass means the same gravity, so the planets of the Solar System would keep orbiting the black hole as if nothing had happened ( nasa.gov ).

Black holes are quite the space phenomenon, with its properties being mysterious. Although predicted and described a century ago, they still possess one of the biggest conundrums for scientists. Originating from collapsed stars, black holes possess such an enormous gravity that they are able to distort time and space. However, as scientists claim, Earth is not in danger—yet.

Redd, Nola Taylor. “What is a Black Hole?” Space.com. N.p., n.d. Web. 10 Aug. 2015.

“10 Amazing Facts about Black Holes.” Universe Today. N.p., 22 Jan. 2015. Web. 10 Aug. 2015.

Dunbar, Brian. “What is a Black Hole?” NASA. NASA, n.d. Web. 10 Aug. 2015.

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Home — Essay Samples — Science — Black Hole — An Overview Of A Black Hole

An Overview of a Black Hole

Categories: Black Hole Universe

About this sample

Words: 1535 |

Published: Mar 18, 2021

Words: 1535 | Pages: 3 | 8 min read

Works Cited

Akiyama, K., et al. (2019). First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole. The Astrophysical Journal Letters, 875(1), L1. https://doi.org/10.3847/2041-8213/ab0ec7
Broderick, A. E., & Loeb, A. (2019). Imaging a Black Hole with the Event Horizon Telescope. The Astrophysical Journal Letters, 875(1), L4. https://doi.org/10.3847/2041-8213/ab1141
Falcke, H., & Markoff, S. (2013). The Galactic Center Black Hole Laboratory. Classical and Quantum Gravity, 30(24), 244003. https://doi.org/10.1088/0264-9381/30/24/244003
Ghez, A. M., et al. (2008). Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits. The Astrophysical Journal, 689(2), 1044-1062. https://doi.org/10.1086/592738
Kormendy, J., & Ho, L. C. (2013). Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies. Annual Review of Astronomy and Astrophysics, 51(1), 511-653. https://doi.org/10.1146/annurev-astro-082708-101811
Marconi, A., & Hunt, L. K. (2003). The Relation between Black Hole Mass, Bulge Mass, and Near-Infrared Luminosity. The Astrophysical Journal Letters, 589(1), L21-L24. https://doi.org/10.1086/375804
Narayan, R., & McClintock, J. E. (2013). Observational Evidence for a Black Hole Event Horizon. New Journal of Physics, 14(5), 055024. https://doi.org/10.1088/1367-2630/14/5/055024
Rees, M. J. (1984). Black Hole Models for Active Galactic Nuclei. Annual Review of Astronomy and Astrophysics, 22(1), 471-506. https://doi.org/10.1146/annurev.aa.22.090184.002351
Shiokawa, H., et al. (2019). Measuring the Radius of a Black Hole at the Center of NGC 3147. The Astrophysical Journal Letters, 880(1), L20. https://doi.org/10.3847/2041-8213/ab298f
Vazdekis, A., et al. (2019). Stellar Populations of the Central Region of NGC 3147: Evidence for Recent Residual Star Formation. Monthly Notices of the Royal Astronomical Society, 482(1), 1150-1162. https://doi.org/10.1093/mnras/sty2635

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Title: black hole essay.

Abstract: This essay gives a very general introduction to Schwarzschild black holes. First, it focuses on some of its classical features as solutions to Einstein's theory of gravity. In the second part it discusses briefly some specific quantum aspects and how a black hole processes quantum information. No previous knowledge about black holes, gravity or quantum mechanics is required.

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The Mystery Behind Black Holes. An Essay

Essay, 2018, eva lozano (author), the mystery behind black holes.

Known for its strong gravitational field and captivating mystery, a black hole, also referred as a singularity, remains confusing and indescribable to all of those who attempt to comprehend it; something so fascinating, yet unseen, unrecorded by man, and undetected by technology. Black holes prevail as one of the universe's greatest phenomenons.

The definition of a black hole is “a region of space [that has] a gravitational field so intense that no matter or radiation can escape” (Smith), which fails to fully describe a black hole. They are not completely understood by humanity, but there are some things that scientists are well aware of, for instance, how they come to be. There are multiple ways to trigger the creation of a black hole, one of them being when a large mass in space accumulates in a very small area. Hawking says “it is like piling more and more books into a library. Eventually, the shelves will give way, and the library will collapse into a black hole” (Hawking). Another way black holes are created is in the collision of two stars within a binary system. After merging, a black hole is born. The third way for a black hole to be created is when a star eventually runs out of fuel, and if the mass of the star is so immense that it can't be held, then the star will shrink and its matter will be compressed into an “infinitely small, infinitely dense point called a singularity. This is the center of a black hole” (Allen). You may be wondering how it is a black hole dies, given that some of them come from dead stars. In other words, how can something that is already dead... die? This happens because of Hawking radiation. In the event horizon of a black hole, there are matter and antimatter particles merging at all the times and converting into energy. As a consequence, if an antimatter particle falls into the singularity of the black hole then it will merge with a matter particle within the singularity of the black hole, and “antimatter destroys matter” (Brandvold). Therefore, the black hole would shrink but it would be almost insignificant since “The bigger the Black hole, the shorter the lifespan” (Brandvold).

Secondly, it is also important to know how black holes work, and to analyze some of the theories that are not yet understood by the public. One of these theories was developed by scientist Albert Einstein, he said that if an astronaut got close to a black hole he or she would not notice it and would eventually pass the event horizon of the black hole (the place of no return). Once you pass the event horizon it is impossible to escape. This theory states that eventually the black hole will pull the astronaut apart resulting in his death. This is called the Firewall paradox. There is another theory that is called the holographic theory which causes extreme controversy, however it is the one that scientist are more inclined to. This ideology states the following; When matter passes the event horizon, the black hole turns everything into information. Information is what everything is made of, its the arrangement of particles. Arrange the particle one way you get a banana, use the same particles arranged differently you get a cellphone, add more and more particles in different arrangements and you can get a human. So essentially all of those substances that pass the event horizon are converted into information and are changed from a 3D state to a 2D state. However the information would be displayed in a hologram and would appear to be 3D but in reality is not. If what entered the black hole is a person, the person would not notice that he's physical state has changed. The final theory also has to do with information, it was developed by Stephen Hawking. He claims that all matter once in the black hole becomes information, but what happens when the black hole disappears? It would mean that all information would be lost, therefore the particles that come out on the black hole would make no sense and “bear no relation of what fell in” (Hawking). If this is true than we would not have any past, because if all information is lost we would have no knowledge of our roots therefore we would have no identity. However, Hawking has presented a thesis that could explain what happens to the information, he says that information is preserved therefore a black hole is not what people used to think it was, it is not a prison with no exit, “this tell us about whether it is possible to fall in a black hole, and come out in another universe” (Hawking). Information would not be accessible but it would be saved.

The death of a star provokes the initiation of a black hole, it is important to add that this only happens if the star that dies has a mass that is more than 2.8 times the mass of the sun; it is then that no force will be able to stop the collapse. Moving on to a different point, it is also important to mention that black holes distort our concepts of space and time. A curvature of space time is created when near a massive body, meaning that if a person were to be orbiting on the edge and manage to not fall into the event horizon, time would slow down for that person. A scenario could be one is orbiting the black hole and you stay that way for a week, you come back to earth only to find out 10 years have gone by, but you have only aged a week. Near the event horizon time slows down, so that week you spent in there it would go by in slow motion, but time back home would stay the same, and if the black hole is big enough that week could even be the equivalent to billions of years down in planet earth.

Subsequently, what has been said above may be confusing, and at times hard to grasp. Nonetheless, this is an extremely fascinating topic, a theorem that will continue to bring controversy upon humanity. Scientists will keep discovering more about black holes, new theories will be proven legitimate, while others might not. Research will advance in this field, with the hope that in the future they will no longer be perplexing to the human brain. Instead, they will be something rather transparent yet staggering for all civilization.

Dunbar, Brian. “What Is a Black Hole?” NASA, NASA, 21 May 2015,

Green, Brian. “What Happens To Time Near A Black Hole.” Youtube, (World Science U.) 24, Feb. 2014.

Kurzgesagt. “Why Black Holes Could Delete The Universe.” (Crash Course.) 24, Aug. 2017.

Ouellette, Jennifer. “Black Hole Firewalls Confound Theoretical Physicists.” Scientific American, 21 Dec. 2012.

Perry, Philip. “The Basis of the Universe May Not Be Energy or Matter but Information.” Big Think, Big Think, 27 Aug. 2017.

Plait, Phil. “Black Holes: Crash Course Astronomy #33.” Youtube, (Crash Course) 25, Sept. 2015.

Skorucak, Anton. “How Does a Star Become a Supernova or a Black Hole? How Does the Star Decide Which One to Turn into?” What Is the Difference between Paramagnetism and Ferromagnetism? 12, May. 2018.

The Information Paradox for Black Holes, S.W. Hawking. Sep 3, 2015.

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Black Holes

Find out why we can’t see them!

At the center of most galaxies is one of the strangest and deadliest things in the universe: a black hole.

Most black holes, regardless of their size, are born when a giant star runs out of energy. The star implodes, and its center collapses under its own weight. This causes an explosion called a supernova. The giant star is eventually squashed into a supersmall dot you can’t see.

A black hole’s gravity, or attractive force, is so strong that it pulls in anything that gets too close. It can even swallow entire stars. Nothing can move fast enough to escape a black hole’s gravity. This includes light, the fastest thing in the universe. That’s why we can’t see black holes in space—they've gobbled up all the light. Though astronomers can’t see black holes, they know they’re there by the effect they have on objects that get too close.

Two types of black holes exist. Supermassive black holes are the largest type of black hole. They’re up to one million times more massive than 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*. (A* is scientist-code for “A-star.”) The most common type of black holes, stellar black holes, are only up to 20 times more massive than our sun .

The intense gravity near a black hole makes time behave in strange ways. If an astronaut left his spacecraft to explore a black hole up close, he’d see the hands on his watch ticking at normal speed. But if anyone back on the spacecraft could observe the astronaut’s watch from far away, they’d see its hands slow down as the spacewalker got closer to the black hole. When the spacewalker returned to the spaceship after an hour-long spacewalk, years would have passed for those aboard the spacecraft.

Someday humans might be able to use black holes to time travel forward. An astronaut could take a short trip near a black hole and return to Earth after years, decades, or even centuries had passed there. A black hole time machine could allow an astronaut to find out what the world will be like in the future. But going back in time? That’s a different challenge altogether!

DID YOU KNOW?

• Thousands of potential black holes have been discovered, but NASA thinks there could be more than a billion of them in space.

• Black holes don't live forever. They slowly evaporate over time, returning their energy to the universe.

• In 2015 two black holes crashed into each other more than a billion light-years from Earth. (A light-year is the distance light travels in one year.) They weren’t destroyed though—they just merged to create a bigger black hole.

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Black Hole - Free Essay Examples And Topic Ideas

Black holes, regions in space where gravitational forces are so intense that nothing, not even light, can escape their pull, are among the most mysterious and intriguing objects in the cosmos. Essays on black holes could explore their formation, properties, and the physics governing their behavior. Discussions might also delve into the discoveries, theoretical predictions, and the cutting-edge research aiming to unravel the mysteries surrounding black holes. Additionally, exploring the depiction of black holes in popular culture, their potential implications for our understanding of the universe, and the technological advancements enabling the study of extreme cosmic phenomena can provide a captivating insight into the enigmatic nature of black holes and their place within the broader cosmic narrative. We’ve gathered an extensive assortment of free essay samples on the topic of Black Hole you can find in Papersowl database. You can use our samples for inspiration to write your own essay, research paper, or just to explore a new topic for yourself.

The Study of Black Holes

The study of black holes are important because they are a great unknown that could change modern day science as a know it. Black holes are among one of the strangest things in our universe. To understand why blacks holes are so important you first have to know what they are. A black hole is a large amount of matter packed into a very small space. The result is a gravitational field so strong that nothing, not even light, can […]

What are Black Holes?

Have you ever wondered what lies at the center of our Milky Way, what happens to stars when they die, or what may lie in the darkest spots of the observable universe? The answer to all of those questions is black holes. Albert Einstein was the first one to suggest that black holes existed in 1926; he used it in his general theory of relativity. An actual black hole was discovered in 1971. Ever since black holes have been known […]

Supermassive Black Holes

Thanks to recent advancements in technology, astronomers have been given the means to better understand how supermassive black holes formed, as well as their relation to the evolution of their respective galaxies. Before understanding what a supermassive black hole is, it is probably best to learn about normal black holes in comparison. A black hole is essentially a vortex containing a gravitational field that is strong enough to prevent any form of matter or radiation from escaping it. As the […]

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Black Hole: a Black Sphere in the Universe

To begin with, what is a black hole? A black sphere in the universe that sucks up everything within its path? Although black holes do capture objects in their entirety, this is only plausible if the object comes within the gravitational force field of the black hole, meaning, as cool as it sounds, no it does not ""suck"" things into itself. How do black holes form? For a black hole to come about, a star has to die, when this […]

The Universe of Black Holes

Abstract Black holes are some of the strangest and most fascinating objects found in outer space. They are objects of extreme density, with such strong gravitational attraction that even light cannot escape from their grasp if it comes near enough. Albert Einstein first predicted black holes in 1916 with his general theory of relativity. The term ""black hole"" was coined in 1967 by American astronomer John Wheeler, and the first one was discovered in 1971. Stellar-mass black holes are formed […]

The Phenomenon of Black Holes

In many films and even television shows, when the idea of black holes is discussed we see a common theme of these phenomena being deemed as either a time warp, or as a form of transport from one place to another. Science Fiction films have created the idea that black holes serve as a way for space travelers to either pass through and jump out somewhere across the universe, or as a way to communicate with the past and the […]

Black Holes: Facts, Theory and Definition

First before we go into details, a black hole is a region of space that has a gravitational force that's so intense that no matter or radiation can escape. Black holes are created by a star that reaches the end point of their life and has a mass that's three times stronger than our sun's mass. That same star then gets crushed under its own gravity and keeps collapsing until all of the mass is concentrated into a tiny space. […]

Myths and Folktales about Black Holes

Black Holes are the places in space where the gravitational pull or force is so strong that light can not even escape. Personally, I found Black Holes to be the most interesting and questionable thing we have discussed in Astronomy 101 because of the lack of knowledge we, as humans, know about them. Growing up as a child, there were myths and folktales that Black Holes went around eating galaxies, stars, and planets. After this semester, in Astronomy 101, it […]

Exposing Black Holes

A captain and his crew bracing for dear life as they descend nearer and nearer toward the center. Two brave young astronauts launching themselves full throttle into unknown depths just to see what lies beyond. A massive force consuming entire galaxies in its wake, including a little planet named Earth who so happened to be in its path. The media is full of adventurous notions and misconceptions about black holes, but what is a black hole really? Black holes are […]

Are Black Holes a Threat to Mankind?

In space, there is nothing more frightening than the words "black hole." The inferences made by long-distance observations indicate something sinister about an object that seemingly consumes light and energy. "Black holes were theorized more than 200 years ago and later were predicted by Einstein's theory of general relativity. The discovery of active galaxies forced astronomers to think that monstrous black holes really do exist and are the 'engines' at the heart of these fireworks. The gushers of light and […]

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Section 1 of the four-part series on black holes. THe section determines what the dark hole is, goes back to the origins of black hole research, and demonstrates how physicists came to terms with the creation of these strange objects. Section 2 can discuss the role black holes play in galaxies and how hidden objects will turn into some of the brightest things in the worlds. Section 3 can tell how astronomers discover black holes using the most intelligent observatories […]

Black Holes: Mysterious in Many Ways

Two recent discoveries continue to mystify us and puzzle astronomers. Recently a cosmic gas cloud had a deadly encounter with Sagittarius A, only to pass through it. Astronomers are mystified and still fighting each other about it. From recording x-rays from two different locations, we were able to measure the speed of a black hole called NGC 1365. It was discovered to be spinning at the max speed that physics will allow, and hopefully, the speed will reveal a little […]

On the Relevance of Black Holes and Supermassive Black Holes to Human Development

It has been said that Einstein once dreamed that he himself was traveling with a photon--a single particle of light. He was attempting to imagine past the boundary of the then known physical theories. It was an endeavor that would eventually produce both General, and Special Relativity. These two theories provided mankind things like GPS technology, more efficient communication technologies (communication satellite coordination), and seemingly, an overall truer knowledge of reality. In fact, relativistic physics have birthed an unimaginable level […]

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English Essay on “Black Holes” Astronomy Essay, Paragraph, Speech for Class 6, 7, 8, 9, 10, 12 Exam.

Black holes.

The Search for Black Holes: Both As A Concept And An Understanding For ages people have been determined to explicate everything. Our search for explanation rests only when there is a lack of questions. Our skies hold infinite quandaries, so the quest for answers will, as a result, also be infinite. Since its inception, Astronomy as a science speculated heavily upon discovery), and only came to concrete conclusions later with closer inspection.

Aspects of the skies which at one time seemed like reasonable explanations are now laughed at as egotistical ventures. Time has shown that as better instrumentation was developed, a more accurate understanding was attained. Now it seems, as we advance on scientific frontiers, the new quest of the heavens is to find and explain the phenomenon known as a black hole.

The goal of this paper is to explain how/the concept of a black hole came about, and give some insight on how black holes are formed and might be tracked down in our more technologically advanced future. Gaining an understanding of a black hole allows for a greater understanding of the concept of spacetime and maybe give us a grasp of both science fiction and science fact. Hopefully, all the clarification will come by the close of this essay.

A black hole is probably one of the most misunderstood ideas among people outside of the astronomical and physical communities. Before an understanding of how it is formed can take place, a bit of an introduction to stars is necessary This will shed light on the black hole philosophy. A star is an enormous fireball, fueled by a nuclear reaction at its core which produces massive amounts of- heat and pressure. It is formed when two or more enormous gaseous clouds come together which forms the core, and as an aftereffect the conversion, due to that impact, of huge amounts of energy from the two clouds.

The clouds come together with a great enough force, that a nuclear reaction ensues. This type of energy is created by fusion wherein the atoms are forced together to form a new one. In turn, heat in excess of millions of degrees Fahrenheit is produced. This activity goes on for eons until the point at which the nuclear fuel is exhausted. Here is where things get interesting.

For the entire life of the star, the nuclear reaction at its core produced an enormous outward force. Interestingly enough, an exactly equal force, namely gravity, was pushing inward toward the center.

The equilibrium of the two forces allowed the star to maintain its shape and not break away nor collapse. Eventually, the fuel for the star runs out, and it this point, the outward force is overpowered by the gravitational force,’ and the object caves in on itself. This is a gigantic implosion. Depending on the original and final mass of the star, several things might occur.

A usual result of such an implosion is a star known as a white dwarf. This star has been pressed together to form a much more massive object. It is said that a teaspoon of matter of a white dwarf would weigh 2-4 tons. Upon the first discovery of a white dwarf, a debate arose as to how far a star can collapse. And in the 1920s two leading astrophysicists, Subrahmanyan Claandrasekgar and Sir Arthur Eddington came up with different conclusions.

Chandrasekhar looked at the relations of mass to the radius of the star and concluded an upper limit beyond which collapse would result in something called a neutron star. This limit of 1.4 solar masses was an accurate measurement and in 1983, the Nobel committee recognized his work and awarded him their prize in Physics. The white dwarf is massive but not as massive as the next order of imploded stars known as neutron stars. Often as the nuclear fuel is burned out, the star will begin to shed its matter in an explosion called a supernova.

When this occurs the star loses an enormous amount of mass, but that which is left behind, if greater than 1.4 solar masses, is a densely packed ball of neutrons. This star is so much more massive that a teaspoon of its matter would weigh somewhere in the area of 5 million tons in earth’s gravity. The magnitude of such a dense body is unimaginable. But even a neutron star isn’t the extreme when it comes to a star’s collapse. That brings us to the focus of this paper. It is felt, that when a star is massive enough, anywhere in the area of or larger than 3-3.5 solar masses, the collapse would cause something of a much greater mass. In fact, the mass of this new object is speculated to be infinite.

Such an entity is what we call a black hole. After a black hole is created, the gravitational force continues to pull in space debris and all other types of matter in. This continuous addition makes the hole stronger and more powerful and obviously more massive. The simplest three-dimensional geometry for a black hole is a sphere.

This type of black hole is called a Schwarzschild black hole. Kurt Schwarzschild was a German astrophysicist who figured out the critical radius for a given mass that would become a black hole. This calculation showed that at a specific point matter would collapse to an infinitely dense state. This is known as the singularity. Here too, the pull of gravity is infinitely strong, and space and time can no longer be thought of in conventional ways.

A singularity, the laws defined by Newton and Einstein no longer hold true, and a mysterious world of quantum gravity exist. In the Schwarzschild black hole, the event horizon, or skin of the black hole, is the boundary beyond which nothing could escape the gravitational pull. Most black holes would tend to be in a consistent spinning motion, because of the original spin of the star. This motion absorbs various matter and spins it within the ring that is formed around the black hole.

This ring is the singularity. The matter keeps within the Event Horizon until it has spun into the center where it is concentrated within the core adding to the mass. Such spinning black holes are known as Kerr Black Holes. Roy P. Kerr, an Australian mathematician happened upon the solution to the Einstein equations for black holes with angular momentums. This black hole is very similar to the previous one. There are, however, some differences that make it more viable for real, existing ones.

The singularity in this hole is more time-like, while the other is more space-like. With this subtle difference, objects would be able to enter the black hole from regions away from the equator of the event horizon and not be destroyed. The reason it is called a black hole is that any light inside of the singularity would be pulled back by the infinite gravity so that none of it could escape.

As a result, anything passing beyond the event horizon would disappear from sight forever, thus making the black hole impossible for humans to see without using technologically advanced instruments for measuring such things as radiation. The second part of the name referring to the hole is due to the fact that the actual hole, is where everything is absorbed and where the center core presides.

This core is the main part of the black hole where the mass is concentrated and appears purely black on all readings even through the use of radiation detection devices. The first scientists to really take an in-depth look at black holes and the collapsing of stars, were professor, Robert Oppenheimer, and his student Hartland Snyder, in the early nineteen hundred. They concluded on the basis of Einstein’s theory of relativity that if the speed of light was the utmost speed over any massive object, then nothing could escape a black hole once in its clutches.

It should be noted, all of this information is speculation. In theory, and on Supercomputers, these things do exist, but as scientists must admit, they’ve never found one. So the question arises, how can we see black holes? Well, there are several approaches to this question. Obviously, as realized from a previous paragraph, by seeing, it isn’t necessarily meant to be a visual representation. So we’re left with two approaches. The first deals with X-ray detection.

In this precision measuring system, scientists would look for areas that would create enormous shifts in energy levels. Such shifts would result from gases that are sucked into the black hole. The enormous jolt in gravitation would heat the gases by millions of degrees. Such a rise could be evidence of a black hole. The other means of detection lies in another theory altogether.

The concept of gravitational waves could point to black holes, and researchers are developing ways to read them. Gravitational Waves are predicted by Einstein’s General Theory of Relativity. They are perturbations in the curvature of spacetime. Sir Arthur Eddington was a strong supporter of Einstein, but was skeptical of gravity waves and is reported to have said, Gravitational waves propagate at the speed of thought.

But what they are as important to a theory. Gravitational waves are enormous ripples emanating from the core of the black hole and other large masses and are said to travel at the speed of light, but not through spacetime, but rather as the backbone of spacetime itself. These ripples pass straight through matter, and their strength weakens as it gets farther from the source. The ripples would be similar to a stone dropped in water, with larger ones toward the center and fainter ones along the outer circumference.

The only problem is that these ripples are so minute that detecting them would require instrumentation way beyond our present capabilities. Because they’re unaffected by matter, they carry a pure signal, not like X-rays which are diffused and distorted. In simulations, the black hole creates a unique frequency known as its natural mode of vibrations. This fingerprint will undoubtedly point to a black hole if it’s ever seen. Just recently a major discovery was found with the help of The Hubble Space Telescope.

This telescope has just recently found what many astronomers believe to be a black hole, after being focused on a star orbiting an empty space. Several pictures were sent back to Earth from the telescope showing many computer-enhanced pictures of various radiation fluctuations and other diverse types of readings that could be read from the area in which the black hole is suspected to be. Because a black hole floats wherever the star collapsed, the truth is, it can vastly affect the surrounding area, which might have other stars in it. It could also absorb a star and wipe it out of existence.

When a black hole absorbs a star, the star is first pulled into the Ergosphere, this is the area between the event horizon and singularity, which sweeps all the matter into the event horizon, named for its flat horizontal appearance and critical properties’ where all transitions take place. The black hole doesn’t just pull the star is like a vacuum, rather it creates what is known as an accretion disk which is a vortex-like phenomenon where the. star’s material appears to go down the drain of the black hole. When the star is passed on into the event horizon the light that the star ordinarily gives off builds inside the of the black hole but doesn’t escape. At this exact point in time, high amounts of radiation are given off, and with the proper equipment, this radiation can be detected and seen as an image of emptiness or as preferred, a black hole.

Through this technique astronomers now believe that they have found a black hole known as Cygnus This supposed black hole has a huge star orbiting around it, therefore we assume there must be a black hole that it is in orbit with. Science Fiction has used the black hole to come u movies and fantastical event p with severals related to the massive beast.

Tales of time travel and of parallel universes lie beyond the hole. Passing the event horizon could send you on that fantastical trip. Some think there would be enough gravitational force to possibly warp you to an end of the universe or possibly to a completely different one. The theories about what could lie one. beyond a black hole are endless. The real quest is to first find

So the question remains, do they exist? Black holes exist, unfortunately for the scientific community, their life is restricted to formulas and supercomputers. But, and there is a but, the scientific community is relentless in its quest to build a better means of tracking Already the advances of hyper-sensitive only get better. equipment is showing some good signs, and the accuracy will only get better.

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English Essay, Paragraph, Speech on “Black Holes” for Kids and Students for Class 8, 9, 10, Class 12 and Graduation Examination

Black Holes

What if I told you the most powerful object in the universe was no bigger than a city? What if I told you it had enough power nothing could escape its grasp, even light? What is this, you ask. A black hole. What is a black hole? A black hole is an old star that has run out of fuel. The pressure created by its fuel keeps the star from collapsing in on itself, but since it runs out of hydrogen, it collapses on itself and becomes so small it literally disappears from the universe. The star must be bigger than a medium-sized star otherwise it would just burn out and become a black dwarf star. Now that the black hole has crushed itself, what does it do? Well, a black hole (to be classified as a black hole) has at least three solar masses. That is, the mass of three solar systems such as our milky way. Its gravitational pull is so great that even light can’t escape. It just sits here collecting particles from the universe that passes it. Now what is so hard about studying black holes? They don’t emit light.

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3 Minute Speech On Black Hole In English

Good morning one and all. Respected Principal, teachers and my dear friends, it is my pleasure and privilege to stand before you today. I am honored to have this opportunity to speak to such a distinguished audience.Today on this occasion, I would like to discuss one of the universe’s most intriguing objects: the black hole.

A black hole is an area of space where the gravitational pull is so intense that nothing can escape from it—not even light. As a large star falls under the weight of its own gravity, a singularity forms at the centre of the object. Black holes can be as small as a few times the mass of our Sun or as large as billions of times its mass. They don’t emit any light, therefore they are invisible, but their impact on adjacent things can reveal their presence.

The term “accretion disk” refers to the swirling disc of stuff that forms when a star or gas cloud comes too close to a black hole and is drawn in by its powerful gravity.

The area surrounding a black hole beyond which nothing can escape is known as the event horizon. Once an object has passed the event horizon, it is drawn towards the singularity at the black hole’s centre, where it is reduced to an infinitesimally small point.

Black holes are fascinating subjects to research because they shed light on the fundamental properties of space and time. Several of the most fundamental tenets of physics, including the theory of relativity and the laws of thermodynamics, have been uncovered through research on black holes.

Many discoveries, including the discovery of gravitational waves—ruffles in space-time brought on by the collision of two black holes—have supported the existence of black holes. These observations have given scientists useful information to better comprehend the characteristics of these mysterious objects.

Both scientists and the general population are very interested in them due to their enormous gravity and mystic character. We may learn new things about how the universe functions and the basic rules of physics as we continue to study them. Thank you for being such a wonderful audience.

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Essay on Black Hole in English

A Journey into the Mysteries of Black Holes

Introduction:.

Black holes, the enigmatic behemoths of the cosmos , stand as one of the most perplexing phenomena in the universe . Born from the gravitational collapse of massive stars , these celestial entities possess characteristics that defy our conventional understanding of space, time, and gravity. In this essay, we will delve into the captivating world of black holes, exploring their formation, properties, and the profound impact they have on the fabric of the cosmos. Essay on Black Hole in English

Formation of Black Holes:

The birth of a black hole is a cosmic spectacle that occurs when a massive star exhausts its nuclear fuel . As the star’s core collapses under its own gravity, an irreversible process begins, culminating in the formation of a singularity —a point of infinite density. This singularity is shrouded by an invisible boundary called the event horizon , marking the point of no return. Once an object, including light, crosses this boundary, escape becomes impossible, rendering black holes invisible to direct observation. Essay on Black Hole in English

Properties of Black Holes:

Black holes come in different sizes, ranging from stellar-mass black holes, formed by collapsing stars, to supermassive black holes found at the centers of galaxies . The latter can be millions or even billions of times more massive than our sun. While the singularity lies at the heart of a black hole, it is the event horizon that captures our imagination. Beyond this boundary, the laws of physics as we know them break down. One intriguing property of black holes is their ability to distort spacetime. Einstein’s theory of general relativity predicts that massive objects, like black holes, warp the fabric of spacetime, creating gravitational fields so intense that they alter the trajectory of nearby objects. This effect, known as gravitational lensing, has been observed and confirmed through various astronomical observations, providing indirect evidence of black hole existence. Essay on Black Hole in English

The Mystery of Information Loss:

One of the enduring puzzles surrounding black holes is the information loss paradox. According to classical physics, once an object falls into a black hole, all information about its composition seems lost, as black holes are believed to only have mass, charge, and spin. This apparent violation of quantum mechanics has sparked debates and led to the proposal of alternative theories, such as Hawking radiation—a theoretical prediction by physicist Stephen Hawking. Essay on Black Hole in English

Hawking Radiation and Black Hole Thermodynamics:

In the 1970s, Stephen Hawking proposed a groundbreaking idea that black holes are not entirely black; instead, they emit faint radiation now known as Hawking radiation. This radiation is a consequence of quantum effects near the event horizon, where particle-antiparticle pairs spontaneously form, with one particle falling into the black hole and the other escaping into space. Over immense timescales, this process leads to the gradual loss of mass and energy from the black hole, eventually causing it to evaporate. Essay on Black Hole in English Hawking’s discovery has profound implications, suggesting a link between gravity and quantum mechanics. It also poses a resolution to the information loss paradox, as the information carried away by the escaping particles could, in principle, preserve the details of the swallowed matter. The study of black hole thermodynamics has become a crucial avenue in exploring the connections between gravity , thermodynamics , and quantum mechanics.

Observational Evidence:

While black holes themselves are invisible, their presence can be inferred through the effects they have on nearby matter. Astronomers employ various techniques to detect black holes, including studying the orbits of stars in binary systems , observing the energetic radiation emitted from accretion disks around black holes, and detecting gravitational waves produced by black hole mergers. In 2019, the Event Horizon Telescope (EHT) collaboration achieved a monumental milestone by capturing the first-ever image of a black hole. Located in the center of the galaxy M87, the black hole’s shadow against the luminous accretion disk provided a visual confirmation of these mysterious entities. This groundbreaking achievement marked a historic moment in astrophysics, validating decades of theoretical predictions and observations.

Some of Black Holes discovered by humans are:

Black Holes and Galactic Evolution:

Black holes play a pivotal role in shaping the architecture and evolution of galaxies. At the heart of many galaxies, including our Milky Way, resides a supermassive black hole. As surrounding matter falls into the black hole’s gravitational grasp, it forms an accretion disk, emitting intense radiation and influencing the distribution of gas and stars in the galactic nucleus. The energy released during accretion processes can have profound effects on galactic structures, triggering star formation and influencing the dynamics of stellar populations. Understanding the interplay between supermassive black holes and their host galaxies is essential for unraveling the complex tapestry of cosmic evolution.

Gravitational Waves and Black Hole Mergers:

The detection of gravitational waves by the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo collaborations has opened a new era in astrophysics. Gravitational waves are ripples in spacetime caused by the acceleration of massive objects, such as black hole mergers. The first direct observation of gravitational waves in 2015, resulting from the merger of two stellar-mass black holes, confirmed a key prediction of Einstein’s theory of general relativity . Subsequent detections of black hole mergers have provided invaluable insights into the population, masses, and spins of black holes in the universe. These events also offer a unique opportunity to test the nature of gravity in extreme conditions and probe the properties of matter under extreme gravitational forces.

The Future of Black Hole Exploration:

Advancements in observational techniques, computational simulations, and theoretical models continue to propel our understanding of black holes forward. Future space-based observatories, such as the James Webb Space Telescope, promise to unveil more secrets of the cosmos, while ground-based facilities like the EHT and LIGO / Virgo continue to push the boundaries of observational astronomy. Additionally, ongoing efforts to integrate quantum mechanics with gravity through theories like string theory and loop quantum gravity aim to provide a unified framework for understanding the fundamental forces governing the universe. The quest to reconcile the macroscopic realm of black holes with the microscopic world of quantum mechanics remains one of the grand challenges in theoretical physics.

Conclusion:

Black holes stand as cosmic enigmas, captivating our imagination and challenging the foundations of our understanding of the universe. From their mysterious formation to the profound influence they exert on galactic structures, black holes continue to be at the forefront of astronomical research. The interplay between gravity, quantum mechanics, and thermodynamics in the context of black holes opens a gateway to new realms of scientific exploration. As we venture further into the cosmic abyss, armed with powerful telescopes, sophisticated detectors, and cutting-edge theories, the study of black holes promises to unravel some of the deepest mysteries of the cosmos. In this ongoing journey, each discovery brings us closer to comprehending the nature of space, time, and the intricate dance of forces that govern the cosmos.

माँ पर कहे गए अनमोल विचार

i माँ पर कहे गए अनमोल विचार तो दोस्तों बहुत ही छोटा सा शब्द है ‘माँ’ पर इस शब्द में भावनाये है…

भारत में भ्रभारत में भ्रष्टाचार पर निबंधष्टाचार पर निबंध

भारत में भ्रष्टाचार पर निबंधभारत में भ्रष्टाचार पर निबंधभारत में भ्रष्टाचार पर निबंध

भारत में भ्रष्टाचार पर निबंध भ्रष्टाचार एक ऐसा अनैतिक आचरण है, जिसमें व्यक्ति खुद की छोटी इच्छाओं की पूर्ति हेतु…

जल ही जीवन है Essay on water

जल ही जीवन है क्या आप बिना जल के जीवित रह सकते हो कल्पना करो कि आपको प्यास लगी है…

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Essay on Black Holes

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Formation of Black Holes

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Black Holes and Space-Time

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