Did a hyper-black hole spawn the Universe? The event horizon of a black hole — the point of no return for anything that falls in — is a spherical surface. In a higher-dimensional universe, a black hole could have a three-dimensional event horizon, which could spawn a whole new universe as it forms. It could be time to bid the Big Bang bye-bye. Cosmologists have speculated that the Universe formed from the debris ejected when a four-dimensional star collapsed into a black hole — a scenario that would help to explain why the cosmos seems to be so uniform in all directions. The standard Big Bang model tells us that the Universe exploded out of an infinitely dense point, or singularity. But nobody knows what would have triggered this outburst: the known laws of physics cannot tell us what happened at that moment. “For all physicists know, dragons could have come flying out of the singularity,” says Niayesh Afshordi, an astrophysicist at the Perimeter Institute for Theoretical Physics in Waterloo, Canada.
On the brane Model discrepancy. Black Holes - Science Background. A few words from the scientist Selected references Science background: The following information is provided to give the teacher some additional knowledge about the effect of gravity and black holes. This material can be used to inspire research topics for students or to encourage class discussion. | Back to Top | 1.
What is a black hole? A black hole is defined by the escape velocity that would have to be attained to escape from the gravitational pull exerted upon an object. 2. A common type of black hole is the type produced by some dying stars. To create a massive core a progenitor (ancestral) star would need to be at least 20 times more massive than our Sun. 3.
Newton thought that only objects with mass could produce a gravitational force on each other. One way to picture this effect of gravity is to imagine a piece of rubber sheeting stretched out. 4. A black hole itself is invisible because no light can escape from it. 5. The answer to this question is "not really. " 6. 7. 8. 9. Books. How Giant Black Holes Spin: New Twist Revealed. A newly discovered way to determine the spin of monster black holes could help shed light on the evolution of these bizarre objects and the galaxies they anchor. Astronomers watched as a black hole that sits at the core of a spiral galaxy 500 million light-years from Earth gobbled up gas and dust from its surrounding accretion disk. They were able to measure the distance between the inner edge of the disk and the black hole, which, in turn, allowed them to estimate the black hole's spin.
“If a black hole is spinning, it drags space and time with it, and that drags the accretion disk, containing the black hole's food, closer towards it," study lead author Chris Done, of the University of Durham in the United Kingdom, said in a statement. "This makes the black hole spin faster — a bit like an ice skater doing a pirouette. " [Gallery: Black Holes of the Universe] This black hole blasts out prodigious amounts of energy as it feeds on the material in its accretion disk. How Magnetic Fields Shape Black Holes (Gallery) 'Space Slinky' Erupts from Giant Black Hole (Video) Astronomers using the Hubble Space Telescope have spotted a true space oddity: a monster black hole unleashing a spiraling jet of super-hot plasma that looks surprisingly like a cosmic slinky toy moving through outer space. The cosmic jet is erupting from around the giant black hole at the center of the distant M87 galaxy 50 million light-years from Earth.
It is a whopping 5,000 light-years long and is made up of a long string of gas blobs — some of which seem to zigzag along a spiral path while others appear to loop around in a motion that scientists dubbed a "space slinky. " The scientists pieced together a time-lapse video of the "space slinky" jet from 400 observations taken from 1995 to 2008 with the Wide Field Planetary Camera 2 and the Advanced Camera for Surveys on the venerable Hubble Space Telescope. Study team member Eileen T. "Is this a ballistic effect, like cannonballs fired sequentially from a cannon? " The researchers found evidence for both scenarios. Astronomers Find Mysterious Radio Burst. A new and intense type of radio burst has been discovered in archived views of the cosmos, astronomers revealed today.
The single, short-lived blast of radio waves likely occurred some 3 billion light-years from Earth, and it may signal a cosmic car crash of two neutron stars, the death throes of a black hole—or something else. "This is something that's completely unprecedented," said Duncan Lorimer, an astrophysicist at West Virginia University in Morgantown and the National Radio Astronomy Observatory who led the discovery-making team. He noted that radio-emitting pulsars send out similar emissions, but repeat them every few hours. "We're confused and excited, but it could open up a whole new research field," Lorimer told SPACE.com of the 5-millisecond blip on the cosmic radar screen. "If we really go after these things, we expect to find out that a couple hundred of them occur each day. " The discovery is detailed in the Sept. 27 issue of the online journal Science Express.
Black Hole Devours Star – 139 Days of Stellar Devastation | Video. Black Holes: Warping Time & Space | Video. 18: Black Holes Big and Small. The Strangest Black Holes in the Universe. Credit: Alain R. | Wikimedia CommonsBlack holes are gigantic cosmic monsters, exotic objects whose gravity is so strong that not even light can escape their clutches.
Black holes come in a wide variety of forms, from small stellar-mass bodies to the supermassive beasts that reside at the hearts of galaxies. Here are 10 of the most extreme black holes, from the smallest to the largest and from cannibals to rogues. FIRST UP: The biggest and baddest. Black Hole Images provided by NASA Radiation Detection Telescopes | Black Hole Photos & Images | Black Holes of the Universe. Black Holes Photos. Get Wallpaper Photograph courtesy NASA/CXC/IoA/A. Fabian et al. A view of the central region of the Perseus galaxy cluster, one of the most massive objects in the universe, shows the effects that a relatively small but supermassive black hole can have millions of miles beyond its core. Astronomers studying this photo, taken by the Chandra X-ray Observatory, determined that sound waves emitted by explosive venting around the black hole are heating the surrounding area and inhibiting star growth some 300,000 light-years away.
Astrophysics: Fire in the hole! Andy Potts In March 2012, Joseph Polchinski began to contemplate suicide — at least in mathematical form. A string theorist at the Kavli Institute for Theoretical Physics in Santa Barbara, California, Polchinski was pondering what would happen to an astronaut who dived into a black hole. Obviously, he would die. But how? According to the then-accepted account, he wouldn’t feel anything special at first, even when his fall took him through the black hole’s event horizon: the invisible boundary beyond which nothing can escape. But eventually — after hours, days or even weeks if the black hole was big enough — he would begin to notice that gravity was tugging at his feet more strongly than at his head.
As his plunge carried him inexorably downwards, the difference in forces would quickly increase and rip him apart, before finally crushing his remnants into the black hole’s infinitely dense core. Free interview Zeeya Merali talks about what would happen if she fell into a black hole One for all. Black Hole Diving. What is a black hole, and what would happen if you fell into one? It’s a super-massive object left behind after the death of some stars from which nothing – not even light – can escape. If you fell into one, you’d be ripped apart, fried or trapped forever. Possibly all three. Black holes are dead stars? Yes, kind of. Although not all stars end up as black holes – some just burn out. Otherwise there would be black holes everywhere. So how do you get one? If a star is big enough – and we’re talking at least twenty to twenty-five times bigger than the Sun here – it will end its fiery life in a massive explosion called a supernova.
Cool. Because nothing within a certain distance of the black hole’s centre (a boundary line we call the event horizon), can get out of it – not even light. So how do we know they’re even there? By looking for tell-tale signs of light bent round them – light that passes close enough to be affected by the black hole’s gravity, but not so close that it gets sucked into it. So why would all that nasty stuff happen if you fell in one? What is a Black Hole? | Black Hole Facts, Theory & Definition. 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. There are three types: stellar black holes, supermassive black holes and intermediate black holes.
When a star burns through the last of its fuel, it may find itself collapsing. For smaller stars, up to about three times the sun's mass, the new core will be a neutron star or a white dwarf. But when a larger star collapses, it continues to fall in on itself to create a stellar black hole. Black holes formed by the collapse of individual stars are (relatively) small, but incredibly dense. Scientists aren't certain how such large black holes spawn. Mathematics Links Quantum Encryption and Black Holes.
A proposed mathematical proof that outlines the way information behaves in coded messages may have implications for black holes. The proof suggests that the radiation spit out by black holes may retain information on the dark behemoths. The research focuses on encoding communications in quantum mechanical systems. But it also connects to a long-standing question for physicists: What happens to all the stuff that falls into a black hole, and is it possible to retrieve any information about the black hole? A group of researchers from Switzerland and Canada, led by Frédéric Dupuis, showed that it's possible to encode large messages with relatively small quantum encryption keys, which are keys made up of subatomic particles or photons.
But the result implies something else: If someone could pull out information that is encrypted quantum mechanically in a message between two parties, the same feat should work in nature. Coding with particles Decoding black holes. Cardiff School of Physics and Astronomy. Welcome to the Cardiff Gravitational Physics tutorial pages. We have put together a few pages describing our research into black holes and gravitational waves.
We hope you enjoy them. Also, why not try searching for gravitational waves with our game black hole hunter. Two Minute Introduction A brief introduction to black holes and gravitational waves, with a discussion of the effects of gravitational waves as well as the Hulse-Taylor pulsar - the most famous source of gravitational waves. 1. Gravitational Wave Sources Very massive and fast moving systems will give off gravitational waves. 4. Gravitational Wave Detectors A network of gravitational wave detectors has been built around the world. 7. Detecting Gravitational Waves Even in the very sensitive gravitational wave detectors, the signal we are looking for is very weak. 12.
1. Black Holes and Gravitational Waves. Black holes and gravitational waves are among the most fascinating predictions of Einstein's theory of gravity. Today we have indirect evidence for both, but have directly observed neither. Black holes are ubiquitous: they are responsible for many X-ray sources in the Milkyway, quasars are believed to be powered by their immense gravity and there is indirect evidence that every galaxy hosts a massive black hole at its core. The evidence is indirect because astronomical black holes don't emit any electromagnetic radiation and hence the name black. However, Einstein's theory tells us that they must emit gravitational radiation.
Although this radiation has not been observed directly, there is ample evidence that gravitational waves are responsible for speeding up certain astronomical binaries, the most famous being the Hulse-Taylor binary. What are black holes? How do black holes form? What happens to a neutron star if its mass is slowly increased? Event Horizon and Naked Singularity. What Is a Black Hole? An artist's drawing a black hole named Cygnus X-1. It formed when a large star caved in. This black hole pulls matter from blue star beside it. 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. How Big Are Black Holes? Another kind of black hole is called "stellar. " An artist's drawing shows the current view of the Milky Way galaxy. The largest black holes are called "supermassive. " How Do Black Holes Form? Stellar black holes are made when the center of a very big star falls in upon itself, or collapses. Scientists think supermassive black holes were made at the same time as the galaxy they are in. This image of the center of the Milky Way galaxy was taken by the Chandra X-ray Observatory. Image Credit: NASA/CXC/MIT/F.K. Could a Black Hole Destroy Earth? Image Credit: Black Holes. Black Holes: Gravity's Relentless Pull interactive: Encyclopedia.
All matter in a black hole is squeezed into a region of infinitely small volume, called the central singularity. The event horizon is an imaginary sphere that measures how close to the singularity you can safely get. Once you have passed the event horizon, it becomes impossible to escape: you will be drawn in by the black hole's gravitational pull and squashed into the singularity. The size of the event horizon (called the Schwarzschild radius, after the German physicist who discovered it while fighting in the first World War) is proportional to the mass of the black hole. Astronomers have found black holes with event horizons ranging from 6 miles to the size of our solar system. But in principle, black holes can exist with even smaller or larger horizons.
By comparison, the Schwarzschild radius of the Earth is about the size of a marble. This is how much you would have to compress the Earth to turn it into a black hole. Black Holes are Actually Green. Hubble, the black hole finder. Hubblecast 43: Hubble and Black Holes. Black Holes, Quasars, and Active Galaxies. Difference between quasars, pulsars, and black holes. Black hole. No Escape: The Truth about Black Holes. Black Holes. Videos. Black Holes. Black Holes. How Black Holes Work" BLACK HOLES by Ted Bunn. Black Holes: Gravity's Relentless Pull. Black Holes: Gravity's Relentless Pull interactive: Encyclopedia.
Schwarzes Loch. Schwarzes Loch. Black Holes. Schwarzes Loch. Übersicht: Das Wichtigste in Kürze - Sterne Galaxien Astronomie - Sterne, Galaxien, Astronomie, Unviersum, Kosmologie, Neutronenstern, Ereignishorizont, Materie, Licht, Energie, Black holes, Schwerkraft, Anziehungskraft, aktive galaktische Kerne. Black Hole. Latest News for Black Holes | What is a Black Hole? Dying Stars & Celestial Objects, Black Holes Facts. Through the Wormhole: The Riddle of Black Holes. The Ultimate Guide to Black Holes. Black Holes. Black Holes, Black Holes Information. BBC Universe - Black holes: How is a waterfall like a black hole? Bizarre Black Holes: Interview With Physicist Kip Thorne.
Types of Black Holes. White Holes. Binary Black Hole Systems. Gravitational Waves. Gravitational Lensing. Spacetime. Black Hole Collisions and Mergers. Black Hole Myths. Black Hole Experiments. Black Hole Controversies. Black Hole Quizzes. GW group Birmingham : Black Holes and Lasers. Hawking Radiation. Plasma.