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Black Holes part 2
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Julie Send message Joined: 28 Oct 09 Posts: 34053 Credit: 18,883,157 RAC: 18 |
Winds from Black Holes Pack Surprisingly Strong Punch To help solve this mystery, scientists investigated the black hole called MQ1 at the center of its host galaxy, M83, for more than a year. The galaxy lies about 15 million light-years away from Earth in the constellation Hydra, and is one of the closest and brightest spiral galaxies in the sky, visible with only binoculars. rOZZ Music Pictures |
Lynn Send message Joined: 20 Nov 00 Posts: 14162 Credit: 79,603,650 RAC: 123 |
For the first time, astronomers have directly measured how fast a black hole spins, clocking its rotation at nearly half the speed of light. That's fast. http://www.space.com/24936-supermassive-black-hole-spin-quasar.html |
ML1 Send message Joined: 25 Nov 01 Posts: 20283 Credit: 7,508,002 RAC: 20 |
For the first time, astronomers have directly measured how fast a black hole spins, clocking its rotation at nearly half the speed of light. Phew... No surprise but good to see... As well as relativistic time effects, that also adds further weird effects due to frame dragging and also for how whatever raggedy 'event horizon' is greatly distorted from that of a simple sphere... Quite a physics headache! Note also that for rotation to be 'seen', that also suggests that there is no such thing as a 'singularity', which also removes the surrounding impossibilities surrounding the various infinities... Keep searchin', Martin See new freedom: Mageia Linux Take a look for yourself: Linux Format The Future is what We all make IT (GPLv3) |
William Rothamel Send message Joined: 25 Oct 06 Posts: 3756 Credit: 1,999,735 RAC: 4 |
Do you think that the center of a black hole can be any denser than a Neutron Star ? |
ML1 Send message Joined: 25 Nov 01 Posts: 20283 Credit: 7,508,002 RAC: 20 |
Do you think that the center of a black hole can be any denser than a Neutron Star ? The present known physics suggests that to be the case... The question then is what new physics limits the collapse, or whether the limit is time itself. Just for one example, there is going to be some very interesting relatavistic shear across whatever central object as it is spun up to relatavistic significant speeds. You then may well have the effects of relativity AND rotation AND... limiting further collapse... And... It's all got to be Quantum :-) Keep searchin', Martin See new freedom: Mageia Linux Take a look for yourself: Linux Format The Future is what We all make IT (GPLv3) |
Lynn Send message Joined: 20 Nov 00 Posts: 14162 Credit: 79,603,650 RAC: 123 |
maybe? Every black hole conceals a secret — the quantum remains of the star from which it formed, say a group of scientists, who also predict that these stars can later emerge once the black hole evaporates. Black Hole 'Information' Paradox May Have Been Resolved |
Julie Send message Joined: 28 Oct 09 Posts: 34053 Credit: 18,883,157 RAC: 18 |
What Stephen Hawking Really Meant When He Said There Are No Black Holes Hawking's quip instead concerns black holes in a highly theoretical sense. Like many other theorists, Hawking has been trying to understand a paradox eating at the heart of physics. The issue—often referred to as the black hole firewall paradox—implies that physicists might have to abandon (or deeply modify) quantum mechanics or Einstein's general theory of relativity, or both. rOZZ Music Pictures |
Lynn Send message Joined: 20 Nov 00 Posts: 14162 Credit: 79,603,650 RAC: 123 |
NASA's WISE Findings Poke Hole in Black Hole 'Doughnut' Theory A survey of more than 170,000 supermassive black holes, using NASA's Wide-field Infrared Survey Explorer (WISE), has astronomers reexamining a decades-old theory about the varying appearances of these interstellar objects. http://www.nasa.gov/press/2014/may/nasas-wise-findings-poke-hole-in-black-hole-doughnut-theory/index.html pic, inside link. |
anniet Send message Joined: 2 Feb 14 Posts: 7105 Credit: 1,577,368 RAC: 75 |
NASA's WISE Findings Poke Hole in Black Hole 'Doughnut' Theory Very interesting Lynn, thank you, and a pretty picture too. :) Definitely one to watch! A quote from the article: Another way to understand the WISE results involves dark matter. Dark matter is an invisible substance that dominates matter in the universe, outweighing the regular matter that makes up people, planets and stars. Every galaxy sits in the center of a dark matter halo. Bigger halos have more gravity and, therefore, pull other galaxies toward them. Intriguing :) |
anniet Send message Joined: 2 Feb 14 Posts: 7105 Credit: 1,577,368 RAC: 75 |
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John Neale Send message Joined: 16 Mar 00 Posts: 634 Credit: 7,246,513 RAC: 9 |
Rare trio of supermassive black holes found This story has been in the news in South Africa today, because the lead researcher is a South African from my alma mater, the University of Cape Town. |
anniet Send message Joined: 2 Feb 14 Posts: 7105 Credit: 1,577,368 RAC: 75 |
Rare trio of supermassive black holes found That did impress me :) of course I'm totally jealous you went to Cape Town Uni :) it was landlocked Witwatersrand for me :) |
John Neale Send message Joined: 16 Mar 00 Posts: 634 Credit: 7,246,513 RAC: 9 |
Rare trio of supermassive black holes found This story on the UCT website provides some further insight into this discovery. |
PJ Send message Joined: 30 Jun 14 Posts: 127 Credit: 774,387 RAC: 0 |
If using various observatories around the world gives a greater field of view, wouldn't using the same observatories at various times of year as earth moves around sun give an even better perspective? By looking from different positions, the angle of view is changed (or, is this already done?) Sorry if this has been answered previously, I'm new here (LOL) |
ML1 Send message Joined: 25 Nov 01 Posts: 20283 Credit: 7,508,002 RAC: 20 |
If using various observatories around the world gives a greater field of view, wouldn't using the same observatories at various times of year as earth moves around sun give an even better perspective? Yep, already done, from opposite sides of Earth's orbit. Shame we can't also use Voyager... ;-) Keep searchin', Martin See new freedom: Mageia Linux Take a look for yourself: Linux Format The Future is what We all make IT (GPLv3) |
Lynn Send message Joined: 20 Nov 00 Posts: 14162 Credit: 79,603,650 RAC: 123 |
Never going to understand black holes. Supermassive Black Holes Eject Gas Out of Galaxies at Insane Rate University of Sheffield researchers have discovered that supermassive black holes at the cores of some galaxies are ejecting molecular hydrogen gas in immense quantities, sometimes reaching speeds of 1 million kilometers per hour. With these findings, researchers believe they very well may have unlocked the secret to the future evolution of galaxies. http://www.designntrend.com/articles/16410/20140708/supermassive-black-holes-eject-gas-out-of-galaxies-at-insane-rate.htm |
anniet Send message Joined: 2 Feb 14 Posts: 7105 Credit: 1,577,368 RAC: 75 |
Never going to understand black holes. But aren't they great Lynn?! :) From a distance obviously. :) |
Lynn Send message Joined: 20 Nov 00 Posts: 14162 Credit: 79,603,650 RAC: 123 |
But aren't they great Lynn?! :) From a distance obviously. :) Yes Annie :) This next one blows my mind, though have often thought about it. Black Holes May Explode Into 'White Holes' And Pour All Their Matter Into Space, Physicists Say Black holes might end their lives by transforming into their exact opposite — 'white holes' that explosively pour all the material they ever swallowed into space, say two physicists. The suggestion, based on a speculative quantum theory of gravity, could solve a long-standing conundrum about whether black holes destroy information. http://www.huffingtonpost.com/2014/07/18/black-holes-white-holes-explode-_n_5597006.html |
anniet Send message Joined: 2 Feb 14 Posts: 7105 Credit: 1,577,368 RAC: 75 |
But aren't they great Lynn?! :) From a distance obviously. :) Oooooooooh... that is VERY interesting Lynn!! Okay, I know it's speculative... but ('scuse me while I just get into my armchair) they should have come to me years ago on this one... *airy wave*... I could have told them everything I don't know but have always thought! :) |
Bob DeWoody Send message Joined: 9 May 10 Posts: 3387 Credit: 4,182,900 RAC: 10 |
I've had this idea that eventually all the matter in what we know of as space gets swallowed up by ever more massive black holes until there is just one super massive black hole and at that point, another big bang occurs starting it all over again. I've had this idea since they discovered that the universe won't stop expanding and collapse back on itself as they previously thought. I like the idea that the universe is perpetual in some form. Bob DeWoody My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events. |
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