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Gravitational waves detected for 1st time
Posted on Friday, February 19, 2016 @ 21:55:36 EST by vlad

Science News release Feb 11, 2016 from LIGO Caltech: LIGO Opens New Window on the Universe with Observation of Gravitational Waves from Colliding Black Holes

WASHINGTON, DC/Cascina, Italy

For the first time, scientists have observed ripples in the fabric of spacetime called gravitational waves, arriving at the earth from a cataclysmic event in the distant universe. This confirms a major prediction of Albert Einstein’s 1915 general theory of relativity and opens an unprecedented new window onto the cosmos.

Gravitational waves carry information about their dramatic origins and about the nature of gravity that cannot otherwise be obtained. Physicists have concluded that the detected gravitational waves were produced during the final fraction of a second of the merger of two black holes to produce a single, more massive spinning black hole. This collision of two black holes had been predicted but never observed.


The gravitational waves were detected on September 14, 2015 at 5:51 a.m. Eastern Daylight Time (09:51 UTC) by both of the twin Laser Interferometer Gravitational-wave Observatory (LIGO) detectors, located in Livingston, Louisiana, and Hanford, Washington, USA. The LIGO Observatories are funded by the National Science Foundation (NSF), and were conceived, built, and are operated by Caltech and MIT. The discovery, accepted for publication in the journal Physical Review Letters, was made by the LIGO Scientific Collaboration (which includes the GEO Collaboration and the Australian Consortium for Interferometric Gravitational Astronomy) and the Virgo Collaboration using data from the two LIGO detectors.

Based on the observed signals, LIGO scientists estimate that the black holes for this event were about 29 and 36 times the mass of the sun, and the event took place 1.3 billion years ago. About 3 times the mass of the sun was converted into gravitational waves in a fraction of a second—with a peak power output about 50 times that of the whole visible universe. By looking at the time of arrival of the signals—the detector in Livingston recorded the event 7 milliseconds before the detector in Hanford—scientists can say that the source was located in the Southern Hemisphere...

Full press release: https://www.ligo.caltech.edu/news/ligo20160211

Also, very interesting to watch: Press conference announcing the first direct detection of gravitational waves -- February 11, 2016

A series of good articles on CBC:
Gravitational waves: Why they're such a big deal
LIGO makes gravitational wave announcement today
Gravitational waves reveal new type of black hole
Gravitational waves detected for 1st time, 'opens a brand new window on the universe'



 
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"Gravitational waves detected for 1st time" | Login/Create an Account | 1 comment | Search Discussion
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The Ether (Score: 1)
by solaris on Saturday, February 20, 2016 @ 03:10:55 EST
(User Info | Send a Message)
Take the time and study the questions in this video:
https://www.youtube.com/watch?v=_j9wms5KpWQ



 

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