News tagged with black holes
Scientists glimpse universe before the Big Bang
(PhysOrg.com) -- In general, asking what happened before the Big Bang is not really considered a science question. According to Big Bang theory, time did not even exist before this point roughly 13.7 billion ...
Nov 23, 2010 |
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Repulsive gravity as an alternative to dark energy (Part 2: In the quantum vacuum)
(PhysOrg.com) -- During the past few years, CERN physicist Dragan Hajdukovic has been investigating what he thinks may be a widely overlooked part of the cosmos: the quantum vacuum. He suggests that the quantum vacuum has ...
Feb 01, 2012 |
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Every black hole contains a new universe: A physicist presents a solution to present-day cosmic mysteries
Our universe may exist inside a black hole. This may sound strange, but it could actually be the best explanation of how the universe began, and what we observe today. It's a theory that has been explored ...
May 18, 2012 |
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Scientists gear up to take a picture of a black hole
On Wednesday, Jan. 18, astronomers, physicists and scientists from related fields will convene in Tucson, Ariz. from across the world to discuss an endeavor that only a few years ago would have been regarded as nothing less ...
Jan 14, 2012 |
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Fermi telescope discovers new giant structure in our galaxy (w/ Video)
(PhysOrg.com) -- NASA's Fermi Gamma-ray Space Telescope has unveiled a previously unseen structure centered in the Milky Way. The feature spans 50,000 light-years and may be the remnant of an eruption from ...
Nov 09, 2010 |
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Cracks in the Universe: Physicists are searching for the fingerprints of cosmic strings
Physicists are hot on the trail of one of strangest theorized structures in the universe. A team of researchers have announced what they think are the first indirect observations of ancient cosmic strings, ...
Oct 11, 2010 |
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Hubble directly observes the disc around a black hole
(PhysOrg.com) -- Scientists have used the NASA/ESA Hubble Space Telescope to observe a quasar accretion disc -- a glowing disc of matter that is slowly being sucked into its galaxy's central black hole. Their ...
Nov 04, 2011 |
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Giant ring of black holes
(PhysOrg.com) -- Just in time for Valentine's Day comes a new image of a ring -- not of jewels -- but of black holes.
Feb 09, 2011 |
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Physicists may have observed Hawking radiation for the first time
(PhysOrg.com) -- In 1974, Stephen Hawking predicted that black holes emit thermal radiation due to quantum effects, which causes the black holes to lose mass and perhaps ultimately vanish. But despite numerous ...
Sep 28, 2010 |
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Physicists create sonic black hole in the lab
(PhysOrg.com) -- Black holes get their name because they absorb all incoming light, and are so dense that none of that light can escape their event horizon. In a new study, scientists have created a sonic ...
Jan 10, 2011 |
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Mysterious objects at the edge of the electromagnetic spectrum
The human eye is crucial to astronomy. Without the ability to see, the luminous universe of stars, planets and galaxies would be closed to us, unknown forever. Nevertheless, astronomers cannot shake their ...
Mar 19, 2012 |
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Light bending by a black hole may offer proof of extra dimensions
(PhysOrg.com) -- Researchers at the University of Pennsylvania report that a new test for measuring the ability of gravity to bend light seen from distant stars around large objects like black holes may offer proof of the ...
Nov 18, 2010 |
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Large Hadron Collider finds no signatures of microscopic black holes
The CMS experiment at CERN's Large Hadron Collider (LHC) has completed a search for microscopic black holes produced in high-energy proton-proton collisions. No evidence for their production was found and ...
Dec 19, 2010 |
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Physicists discover new way to visualize warped space and time
(PhysOrg.com) -- When black holes slam into each other, the surrounding space and time surge and undulate like a heaving sea during a storm. This warping of space and time is so complicated that physicists ...
Apr 11, 2011 |
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Physicists propose test for loop quantum gravity
(PhysOrg.com) -- As a quantum theory of gravity, loop quantum gravity could potentially solve one of the biggest problems in physics: reconciling general relativity and quantum mechanics. But like all tentative ...
Jan 03, 2012 |
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Black hole
In general relativity, a black hole is a region of space in which the gravitational field is so powerful that nothing, including light, can escape its pull. The black hole has a one-way surface, called an event horizon, into which objects can fall, but out of which nothing can come. It is called "black" because it absorbs all the light that hits it, reflecting nothing, just like a perfect blackbody in thermodynamics. Quantum analysis of black holes shows them to possess a temperature and Hawking radiation.
Despite its invisible interior, a black hole can reveal its presence through interaction with other matter. A black hole can be inferred by tracking the movement of a group of stars that orbit a region in space which looks empty. Alternatively, one can see gas falling into a relatively small black hole, from a companion star. This gas spirals inward, heating up to very high temperature and emitting large amounts of radiation that can be detected from earthbound and earth-orbiting telescopes. Such observations have resulted in the scientific consensus that, barring a breakdown in our understanding of nature, black holes do exist in our universe.
For more information about Black hole, read the full article at
Wikipedia.
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