Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/First_observation_of_gravitational_waves> ?p ?o }
- First_observation_of_gravitational_waves abstract "The first observation of gravitational waves on 14 September 2015 was announced by the LIGO and Virgo collaborations on 11 February 2016. Previously, gravitational waves had been inferred only indirectly, through their effect on the timing of pulsars in binary star systems. The waveform, detected by both LIGO observatories, matched the predictions of general relativity for a gravitational wave emanating from the inward spiral and merger of a pair of black holes of around 36 and 29 solar masses and the subsequent \"ringdown\" of the single resulting black hole. The signal was named GW150914 (i.e., \"Gravitational Wave 2015-09-14\"). It was also the first observation of a binary black hole merger, demonstrating the existence of binary stellar-mass black hole systems, and that such mergers could occur within the current age of the universe.This first observation was reported around the world as a remarkable accomplishment for many reasons. Efforts to directly prove the existence of such waves had been ongoing for over fifty years, and the waves are so minuscule that Albert Einstein doubted they could ever be detected. The waves given off by the cataclysmic merger of GW150914 reached Earth as a ripple in spacetime that changed the length of a 4-km LIGO arm by a thousandth of the width of a proton, proportionally equivalent to changing the distance to the nearest star outside the Solar System by one hair's width. The energy released by the binary as it spiralled together and merged was immense, with the energy of 7000300000000000000♠3.0+0.5−0.5 c2 solar masses (7000530000000000000♠5.3+0.9−0.8×1047 joules) in total radiated as gravitational waves, reaching a peak emission rate of about 7000360000000000000♠3.6+0.5−0.4×1049 watts – a level greater than the combined power of all light radiated by all the stars in the observable universe.The observation confirms the last remaining unproven prediction of general relativity and validates its predictions of space-time distortion in the context of large scale cosmic events (known as strong field tests). It was also heralded as inaugurating a new era of gravitational-wave astronomy, which will enable observations of violent astrophysical events that were not previously possible, and potentially allow the direct observation of the very earliest history of the universe.".
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