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ब्लैक होल की रहस्यमय दुनिया| Black Hole|Black Holes: Discovery Facts and Theories|Blackhole in hindi

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Title - Black Holes: Discovery, Facts and Theories


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Martian Cowboy Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License


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What Would You See As You Fell Into A Black Hole. What is a black hole.

A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it.[1] The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.[2][3] The boundary of the region from which no escape is possible is called the event horizon. Although the event horizon has an enormous effect on the fate and circumstances of an object crossing it, no locally detectable features appear to be observed.[4] In many ways a black hole acts like an ideal black body, as it reflects no light.[5][6] Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe.

Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace.[7] The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, although its interpretation as a region of space from which nothing can escape was first published by David Finkelstein in 1958. Black holes were long considered a mathematical curiosity; it was during the 1960s that theoretical work showed they were a generic prediction of general relativity. The discovery of neutron stars in the late 1960s sparked interest in gravitationally collapsed compact objects as a possible astrophysical reality.

Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. After a black hole has formed, it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses (M☉) may form. There is general consensus that supermassive black holes exist in the centers of most galaxies.

Despite its invisible interior, the presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light. Matter that falls onto a black hole can form an external accretion disk heated by friction, forming some of the brightest objects in the universe. If there are other stars orbiting a black hole, their orbits can be used to determine the black hole's mass and location. Such observations can be used to exclude possible alternatives such as neutron stars. In this way, astronomers have identified numerous stellar black hole candidates in binary systems, and established that the radio source known as Sagittarius A*, at the core of our own Milky Way galaxy, contains a supermassive black hole of about 4.3 million solar masses.

On 11 February 2016, the LIGO collaboration announced the first detection of gravitational waves, which also represented the first observation of a black hole merger.[8] As of April 2018, six gravitational wave events have been observed that originated from merging black holes

El Agua Alcalina Elimina las Células Cancerígenas y Previene el Cáncer y otras enfermedades

Conoces los beneficios del Agua Alcalina o has escuchado los conceptos de alcalinidad o acidez en el cuerpo? Sabías que las células cancerígenas o cancerosas, suelen reproducirse en medios o ambientes con unas ciertas características especiales. Pero también pueden morir si las condiciones medioambientales necesarias para su supervivencia cambian de manera considerable?

Hace años se descubrió que los alimentos son la principal razón por la cual, el equilibrio del ph, acidez o alcalinidad de nuestro cuerpo cambia y es de acuerdo a eso, que las enfermedades como el cáncer se pueden desarrollar.

Un Médico Alemán descubrió también hace casi 90 años, que si se restaura el equilibrio del ph en el organismo, se corta la posibilidad de que las células cancerígenas sobrevivan y se desarrollen.

El día de hoy queremos que conozcas esta preparación llamada Agua Alcalina que se puede hacer con ingredientes caseros y que sirve como terapia natural, para restaurar el ph del organismo, y por ende a prevenir no sólo el #cáncer sino también otro tipo de #enfermedades.
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Music- Militana beach Intro + Source- Hear me now (original mix) by Militana is licensed under a Creative Commons License 3.0.
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सिन्धु सभ्यता - भारत का इतिहास | Indus Valley Civilization - INDIAN HISTORY | Crash course FOR SSC

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GK | General Knowledge Questions and Answers for All Competitive Exams

Hear is the most important questions and answers for all competitive exams
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Sound More Natural in French in 15 Minutes!

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There’s more to mastering French conversation than grinding vocab decks and filling grammar workbook pages. Spoken French is filled with subtlety, nuance and its own set of vocabulary that you will not learn from textbooks. But don’t worry, we got you covered. If you want to take your French conversation skills to the next level, this video is made for you. Our host expresses herself in simple French with English subtitles. This video will challenge your listening comprehension skills and help you progress in your French study.

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Huawei P20 Pro 48hr review

Before our full Huawei P20 Pro review drops, we thought we would give you an insight as to what we're loving and not loving about Huawei's new flagship. This phone has three cameras on the back, an incredible image stabilisation mechanism called AIS and it looks very good in the process. Check out this early 48hr review of Huawei's latest flagship and head over to TechRadar to find out more about this and all the other hottest bits of tech hitting the web.

19 DIY JEWELRY IDEAS FOR KIDS

BECOMING YOUR OWN JEWELRY DESIGNER

It's always good to be crafty. You can make some cool thing for yourself anytime, and also you're never mixed up when it comes to making presents! Every girl loves jewelry, no matter how old she is. Today, I invite you to the world of hand made jewelry! Pendants, earrings, bracelets – learn how to DIY them all!

Let's start with a color-changing pendant. In order to make it, you'll need a metal setting, color-changing paint and a glass drop. Put them all together, attach a chain and enjoy your mood pendant. You can also melt some wax crayons right inside the metal setting, cover it with resin, and create as many stylish pendants and earrings as you want.

A simple paper clip can serve as the base for very cool earrings. Use some threads of your favorite color and wrap the paper clip into them. These stylish triangles are good for everyday wear. Check out some more cool jewelry ideas with threads.

A hot glue gun and colored paper work together perfectly when it comes to making cool accessories. Check out out heart-shaped pendant tutorial and see everything yourself.

Recycling and upcycling may save this planet one day. You can join the recycling movement and create cool accessories just out of simple empty bottles. Plastic is a great material for making jewelry.

You can make a lot of impressive bracelets using pins and glass beads. Just check out our cool tutorial on those awesome bracelets and get one for yourself.

Another awesome idea to try is homemade crystals. Can you imagine that you can grow your own crystals at home just by using a few basic chemicals and some patience. After growing them, you can turn them into jewelry.

Which of these tips you'd love to try? Share your ideas with us in the comments.

TIMESTAMPS:

2:36 - A heart pendant
4:08 - A bracelet made from beads and safety pins
6:06 - Growing crystals
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Mito y realidad de los templarios y las órdenes militares

Conferencia de Félix Rodrigo Mora impartida en Valladolid el pasado 17 de septiembre de 2016, sobre el Mito y la Realidad de los Templarios y su relación con las órdenes Militares Medievales.
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If You See a Bottle on Your Tire, Don't Touch It And Call the Police!

WARNING! If you see a plastic bottle on your tire, call the police! The total value of all the cars that get stolen in the U.S. every single year is 4 billion dollars. Stealing cars is only becoming that much easier thanks to a new trick car thieves are using these days. How to protect your car and valuables from thieves?
It's always better to be forewarned and take preventive measures to protect yourself. For example, why not walk around your car and briefly examine it before every drive? Not only that, there are tons of other ways you can protect yourself and your car from thieves.

TIMESTAMPS
How does the new criminal ploy work 1:18
Where criminals use this trick 2:40
How can you protect yourself 4:12
Take your steering wheel with you when you leave your car. 4:40
Buy a car with a manual transmission. 5:17
Keep the windshield clear. 6:07
Keep your car clean and tidy. 6:38
Take a look around. 7:13
Make sure your car faces your house. 7:51
Etch your car's identification number on each window. 8:27
Use a tire lock. 8:49
Use a baby monitor. 9:20

Music: Cataclysmic Molten Core . Jingle Punks


SUMMARY
-First of all, thieves find a car they like in a parking lot. After that, they place an empty plastic bottle on the front or rear passenger tire. You start the ignition, and just as you’re rolling out of your parking spot, you hear some weird crinkling sound. As you get out of the car to check it out, the criminals either steal the car or grab all the valuables inside and run off.
-The first cases of carjackers using this strategy were reported in Limpopo, South Africa. Another wave of car thefts committed this way swept through Mexico too.
-It's always better to be forewarned and take preventive measures to protect yourself.
-Actually, you can install a quick-release steering wheel so that you can take it with you whenever you leave your car.
-There have been numerous reports from would-be victims explaining how thieves often run away in embarrassment after failing to drive away in a manual.
-Before you leave your car, you should always remove any wiring you may have.
-If there’s a bunch of random stuff lying around in your vehicle, thieves will assume that you’re unorganized.
-Before you leave your car alone, take a look around. Don't try to be discreet about it either.
-Just pull in so that your car faces your house. You don’t really save that much time in the morning by backing in anyway.
-If you have your VIN etched on every window, replacing all the glass won't be worth all the hassle for these criminals.
-You might not know that you can get hold of a tire lock yourself too and use it to prevent car theft.

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Masha and the Bear - Bear + Lady Bear=❤️ Valentine's Day cartoon compilation

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Club Diver by Kevin MacLeod from incompetech.com.
Outro music by MDK,
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BLACK HOLES - Full Documentary - Penetrating the Mystery of Singularities

A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can't see black holes. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars.

How Big Are Black Holes?

Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter, or stuff, in an object.

Another kind of black hole is called stellar. Its mass can be up to 20 times more than the mass of the sun. There may be many, many stellar mass black holes in Earth's galaxy. Earth's galaxy is called the Milky Way.

The largest black holes are called supermassive. These black holes have masses that are more than 1 million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The supermassive black hole at the center of the Milky Way galaxy is called Sagittarius A. It has a mass equal to about 4 million suns and would fit inside a very large ball that could hold a few million Earths.


How Do Black Holes Form?
Scientists think the smallest black holes formed when the universe began.

Stellar black holes are made when the center of a very big star falls in upon itself, or collapses. When this happens, it causes a supernova. A supernova is an exploding star that blasts part of the star into space.

Scientists think supermassive black holes were made at the same time as the galaxy they are in.


If Black Holes Are Black, How Do Scientists Know They Are There?
A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole. Scientists can study stars to find out if they are flying around, or orbiting, a black hole.

When a black hole and a star are close together, high-energy light is made. This kind of light can not be seen with human eyes. Scientists use satellites and telescopes in space to see the high-energy light.


Could a Black Hole Destroy Earth?
Black holes do not go around in space eating stars, moons and planets. Earth will not fall into a black hole because no black hole is close enough to the solar system for Earth to do that.

Even if a black hole the same mass as the sun were to take the place of the sun, Earth still would not fall in. The black hole would have the same gravity as the sun. Earth and the other planets would orbit the black hole as they orbit the sun now.

The sun will never turn into a black hole. The sun is not a big enough star to make a black hole.


How Is NASA Studying Black Holes?
NASA is using satellites and telescopes that are traveling in space to learn more about black holes. These spacecraft help scientists answer questions about the universe.

London Bridge is Falling Down | +More Nursery Rhymes & Kids Songs - Cocomelon (ABCkidTV)

A new compilation video, including one of our most recent songs, London Bridge is Falling Down!

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