Black suck-Do black holes suck? › Dr Karl's Great Moments In Science (ABC Science)

A black hole can only accrete material "suck it in" in your words if it is able to pass the event horizon. Matter that is in orbit about a black hole needs to lose angular momentum before it can fall in, otherwise it just continues to orbit the black hole. In the real universe, black holes which are accreting matter have what are called accretion disks around them. The matter in these disks slowly spirals in to the black hole, and it becomes very hot as it does so we can see the disks glow usually in X-rays. The common conception of a black hole being like a vacuum cleaner "sucking" in any matter that comes anywhere near it is therefore not exactly true.

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Random Question. Instead, it's Black suck back out into the outer regions of the galaxy, where it can fuel the formation of new Blakc and return to the interstellar medium once again. Instead, just like Black suck Cookie Monster eats a cookie, only a tiny fraction actually makes it past the boundary of Black suck event horizon. Site Navigation Video Audio Photos. Intermediate What color is each Balck Why does not light gets exactly come back from black hole?

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Apparently there is a fearsome force that lurks in deep space ready to drag all matter to a crushing, violent end. But Dr Karl isn't so sure and will boldly go where no one has gone before.

Artist's impression of a black hole Source: Reuters. But if our sun were to be replaced by a black hole weighing the same as our sun, the Earth would still travel in the same orbit. The only real difference is that it would be cold and dark, because the black hole would not emit any heat or light. If you throw a rock upwards, pretty soon it falls back down again. But if you propel the rock up with a speed of So the escape velocity of planet Earth is A black hole has such a massive density compared to its size, that the escape velocity is equal to the speed of light, or even greater.

This means that light itself can never escape, and so we can never see it, hence the name black hole. The size of our sun is about 1. So gravity will be the dominant force, and the sun will shrink. If, at the end of nuclear burning, the amount of mass remaining in a star is less than one solar mass the current mass of our sun , then gravity shrinks that star down into an object called a white dwarf.

A white dwarf is the fate of all stars that are left with a mass less than 1. But suppose that you start with a heavier star. If, after the nuclear fires run down, the mass of the star is 1. This gives them a typical escape velocity of about half of the speed of light. So far, the astronomers have found about neutron stars in our Milky Way galaxy, and in its neighbouring galaxies, the Magellanic Clouds.

This point is hidden inside the so-called "event horizon". Black holes can cover a range of sizes. If our Sun were to be turned into a black hole, the event horizon would be about six kilometres across. If an object such as a comet, or even a planet, were on a collision course with the event horizon, yes, it would vanish inside the black hole.

But if it started off in a stable orbit around the sun, then it would continue in the same stable orbit after the sun had been magically turned into a black hole. Email ABC Science. Use this form to email 'Do black holes suck? By clicking 'Send to a friend' you agree ABC Online is not responsible for the content contained in your email message.

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NASA - Ask an Expert: Why Black Holes Suck. Or Do They?

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It only takes a minute to sign up. I was asked the same by my friend. I said that gravitational attraction also occurs for high energy particles. My friend said photon is not so very high energy particle which I found on net. He said some of light gains mass after event horizon and gets pulled. I said that the space time is bent due to huge mass of the black hole. So light has to take bigger curved paths so the light does not come back. Why does not light gets exactly come back from black hole?

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. A black hole is a region of space where all possible paths a particle can take - the technical term is "geodesics" - are constrained to be within that region. In empty space, geodesics can be whatever you want them to be, but once you're in a black hole, all the geodesics remain within the black hole.

There are images out there that might help understand this intuitively, such as this one. Light cannot get out of the black hole because it also moves on a geodesic, and as mentioned above, all the geodesics remain within the black hole.

Episode of the Stack Overflow podcast is here. We talk Tilde Club and mechanical keyboards. Listen now. Sign up to join this community. The best answers are voted up and rise to the top. How does black hole suck light? Asked 1 year, 1 month ago. Active 1 year, 1 month ago. Viewed times. Nobody recognizeable. Nobody recognizeable Nobody recognizeable 7 7 silver badges 18 18 bronze badges.

Sep 14 '18 at This question has been asked before and already has an answer. Some other misconceptions: Gravitational attraction occurs for all particles, not just high energy particles.

Light is not a "very high energy particle". It's an electromagnetic wave and a stream of photons. Light does not have mass. It doesn't "gain mass" after the event horizon. Allure Allure 3, 1 1 gold badge 13 13 silver badges 34 34 bronze badges. In the question. Though I agree with light is not made of high energy particles. And, in at least the Schwarzschild geometry, all world lines within the horizon, geodesics or other, end on the central singularity.

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Black suck

Black suck