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Direct observation of gravitational waves, which commenced with the detection of an event by LIGO in 2015, [1] plays a key role in gravitational wave astronomy.LIGO has been involved in all subsequent detections to date, with Virgo joining in August 2017.
Currently, the most sensitive ground-based laser interferometer is LIGO – the Laser Interferometer Gravitational Wave Observatory. LIGO is famous as the site of the first confirmed detections of gravitational waves in 2015. LIGO has two detectors: one in Livingston, Louisiana; the other at the Hanford site in Richland, Washington.
Since gravitational waves are expected to travel at the speed of light, this distance corresponds to a difference in gravitational wave arrival times of up to ten milliseconds. Through the use of trilateration , the difference in arrival times helps to determine the source of the wave, especially when a third similar instrument like Virgo ...
The signal was named GW150914 (from gravitational wave and the date of observation 2015-09-14). [3] [11] It was also the first observation of a binary black hole merger, demonstrating both the existence of binary stellar-mass black hole systems and the fact that such mergers could occur within the current age of the universe.
Mathematically speaking, if is the amplitude (assumed to be small) of the incoming gravitational wave and the length of the optical cavity in which the light is in circulation, the change of the optical path due to the gravitational wave is given by the formula: [9] = with being a geometrical factor which depends on the relative orientation ...
If you were worried that the first confirmed detection of gravitational waves was just a one-off result... don't be. Researchers analyzing LIGO data have verified a second instance (recorded in ...
This includes neutrino detections by observatories such as IceCube or Super-Kamiokande, gravitational wave events from the LIGO, Virgo and KAGRA interferometers, and gamma-ray bursts observed by Fermi, Swift or INTEGRAL. [1]
Scientists have finally found the gravitational wave background, ushering in Astronomy 2.0. It's literally a whole new way to look at the universe.