Gravity Spied! And Other Exploration Treasures: 2/11/16: Bob Zimmerman, BehindtheBlack.com.

Feb 12, 2016, 06:18 AM

HOUR FOUR (Photo: Numerical simulation of two merging black holes performed by the Albert Einstein Institute in Germany: what this rendition shows through colors is the degree of perturbation of the spacetime fabric, the so-called gravitational waves.) Gravity Spied! And Other Exploration Treasures: 2/11/16: Bob Zimmerman, BehindtheBlack.com. First direct detection of a gravitational wave February 11, 2016 at 9:45 am Robert Zimmerman. "The science team from the Laser Interferometer Gravitational-wave Observatory (LIGO) announced today that on September 14, 2015 they made the first direct detection of a gravitational wave, produced by the merging of two distant black holes. 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 three 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...."