The LIGO, which allowed the first direct observation of gravitational waves, is the largest detector worldwide for this mysterious phenomenon and is able to make one of the most complex scientific experiments today. It is composed of two giant laser interferometers, allowing extremely accurate measurement of interference waves.
These two devices, about four kilometers long, are separated by 3,000 kilometers: one is in Livingston, Louisiana and the other in Hanford, in Washington State. (AFP)
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