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Ashes from massacred planets hide black holes

qubit

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PLANETS and asteroids may be smashing into each other by the thousand around monster black holes. Dust from the collisions could explain why many of these colossal objects, which would otherwise shine brightly as they swallow nearby matter, are hidden from view.

Most galaxies like the Milky Way harbour a central black hole with a mass upwards of a million suns. While the Milky Way's black hole is currently inactiveMovie Camera, many in other galaxies are swallowing up gas from dense discs that surround them, producing copious X-rays and other radiation in the process.

In addition to providing fodder for the black holes, these discs may give birth to millions of stars, explaining the dense star clustersMovie Camera seen in some galaxies' hearts.

These stars may in turn host a lot of planets. But they might have trouble holding onto them, says a team led by Sergei Nayakshin at the University of Leicester, UK.

That is because the stars are crowded together so tightly that frequent gravitational encounters between them would strip planets away, sending them careening through space. En route, they would often crash into each other at speeds much higher than anything that happens in our solar system. Here, collisions typically occur at less than a few tens of kilometres per second. But around a supermassive black hole, objects zip around so fast that crashes would happen at up to 1000 kilometres per second, pulverising the colliding objects.

That would be bad news for any life on the rocky bodies, but Nayakshin thinks the intense X-rays and ultraviolet radiation so close to a black hole would prevent life from forming on these planets in the first place. "It would be unimaginable that you could have life in these sorts of environments," he says.

However, dust from the crashes could explain why many actively feeding black holes are hidden behind a fat doughnut-shaped dust shroud, the team says in an upcoming issue of Monthly Notices of the Royal Astronomical Society.

It is not clear how much dust each doughnut might contain, but assuming it is about 300 suns' worth, that could be produced by grinding up planets from around 100,000 to a million stars, the team estimates. The idea is reasonable, says Richard Mushotzky at the University of Maryland in College Park, adding that the doughnuts have "so far been very difficult to explain".

The dust may also help new stars to form, since it absorbs radiation from the feeding black hole that might otherwise push away star-forming gas.

Lots of links in the article.

New Scientist
 
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When they can tell me what is at the bottom of the ocean, I will believe they can tell me what is going on 100 trillion miles away.
 

qubit

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When they can tell me what is at the bottom of the ocean, I will believe they can tell me what is going on 100 trillion miles away.

Ironically, it's sometimes easier to say what's happening so far away than closer to home, because of the nature of the problem. But I agree, there's always uncertainty in these sorts of findings, due to the indirect nature of detection.
 
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What do they mean by the Milky Way's supermassive is inactive?
 

qubit

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What do they mean by the Milky Way's supermassive is inactive?

It means that there's no significant amount of material falling into it. Black holes can have vast rings of material around them as it swirls inwards. As it compresses, the friction causes intense heat and it glows powerfully, which can be detected with our telescopes.

www.universetoday.com is a great site for all this kind of stuff. :)
 

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I wish the black hole in our galaxy would suck us up ! :rockout:
 
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When they can tell me what is at the bottom of the ocean, I will believe they can tell me what is going on 100 trillion miles away.

That's where the aliens are. Didn't you see The Abyss?
 

qubit

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Nice info. Black and white holes observations are always useful even tho some lame asshead fucktards might say that they are far away and blah *yawns*.
Earth (hence this life) was born from the cosmic energy, it's always interesting to know what happens beyond the borders.

Btw what Movie Camera got to do with this? :confused:


@DarkOCean who says that black hole causes death? Nobody knows what happens beyond event horizon.
 
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I wish the black hole in our galaxy would such us up ! :rockout:
lol yeah that would be sweet. Feel earth crumble slowly losing mass. Losing our atmosphere with it, making space visible in the middle of the day with that giant blackhole up there.. mass hysteria if you ask me :D. Thing would suck us so fast, everything would dissintigrate a few micro milli second. You wont feel a thing. No more problems :D
 

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Ninja holes! Hidden by the ashes of one thousand planets! Sounds like the dialog from a bad Hentia film.
 
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What do they mean by the Milky Way's supermassive is inactive?

its not dragging mass into it and feading is what they mean but as ever in reality they have no clue as the light from said feading would not be seen on earth for a lot of years hence it could well be and they wouldnt know

and as for observing white holes lmao, what are you on, hawking stated them as theory recently, whos got the pics come on show.
 
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When they can tell me what is at the bottom of the ocean, I will believe they can tell me what is going on 100 trillion miles away.

"space is easy man, it's empty"
 
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as for observing white holes lmao, what are you on, hawking stated them as theory recently, whos got the pics come on show.

Black holes is also a theory. Whatever gets in black hole gets kick out of white hole. Such a perfect symmetry. The question is: where it ends ....
 
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Black holes is also a theory.

so is gravity, and evolution. if nothing else they are simply super-dense areas of space, and we can witness their interaction with matter around them. we know they exist.

Whatever gets in black hole gets kick out of white hole. Such a perfect symmetry. The question is: where it ends ....
that part is much more theoretical. obviously nothing is destroyed but we have seen nothing that resembles a white hole that just spews matter from a linked black hole. those may not exist.
 
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if nothing else they are simply super-dense areas of space, and we can witness their interaction with matter around them. we know they exist.
yes there are so many models of the universe, physicists say that maybe time doesn't exist,
that our space isn't 3D. Some say it's 10D (string theory) while others say it's 1D and there's also a group with theory that our universe is a hologram/illusion/simulator program ... you name it.

that part is much more theoretical. obviously nothing is destroyed but we have seen nothing that resembles a white hole that just spews matter from a linked black hole. those may not exist.
Well that theory says white holes don't exist in our space-time. So we can't observe them. Just like black holes don't exist in that space-time where white holes are. Actually it's more complex than we think of it. Dark matter, dark energy, wimps, super-wimps ... etc. The more we know, the less we know. We can only build models and approximate them as much as we can.
 
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yes there are so many models of the universe, physicists say that maybe time doesn't exist,
that our space isn't 3D. Some say it's 10D (string theory) while others say it's 1D and there's also a group with theory that our universe is a hologram/illusion/simulator program ... you name it.
that's why i said if nothing else. we can witness their interaction, so no matter what we know super dense areas of space exist. the rest is hypothetical conjecture.

Well that theory says white holes don't exist in our space-time. So we can't observe them. Just like black holes don't exist in that space-time where white holes are. Actually it's more complex than we think of it. Dark matter, dark energy, wimps, super-wimps ... etc. The more we know, the less we know. We can only build models and approximate them as much as we can.

my point was alluding to this:
However, the second law of thermodynamics states that "in all energy exchanges, if no energy enters or leaves the system, the potential energy of the state will always be less than that of the initial state." White holes apparently do not follow this law, and there is much speculation on the issue of whether or not white holes exist. via WP

it's a much less observable part of the theory, and as such "is much more theoretical" and "may not exist".
 

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do you want do die?

LOL . No I just think it would be cool to watch the solar system being sucked up then watch as this planet is taking into the black abyss :rockout:
 
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Very interesting point, just like heat death. However if space-time isn't "closed system" then second law of thermodynamics wouldn't be the same.

good point. i would expect that to mean there WOULD be white holes in our universe though, albeit emitting energy from other universes.
 

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Sagittarius A* is the nearest "black hole" to us and it is at the center of the Milky Way. I still think "black holes" are confused with solid fission stars (as opposed to gaseous fusion stars). Atomic decay causes them to leak high-frequency radiation, they're obviously very massive, and they're bright because gases still fuse and burn on the surface like a fusion star would (although not as bright as a traditional fusion star). They could even be the source of the background radiation attributed to the "big bang."
 
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