GENERAL KNOWLEDGE

Detailed explanation-1: -On September 14, 2015 those waves reached Earth and were detected by researchers at the Laser Interferometer Gravitational-Wave Observatory (LIGO).

Detailed explanation-2: -A century later, in 2016, researchers successfully detected the first direct evidence of gravitational waves, using the Laser Interferometer Gravitational-Wave Observatory (LIGO).

Detailed explanation-3: -On 15 June 2016, LIGO announced the detection of a second gravitational wave event, recorded on 26 December 2015, at 3:38 UTC. Analysis of the observed signal indicated that the event was caused by the merger of two black holes with masses of 14.2 and 7.5 solar masses, at a distance of 1.4 billion light years.

Detailed explanation-4: -All of this changed on September 14, 2015, when LIGO physically sensed the undulations in spacetime caused by gravitational waves generated by two colliding black holes 1.3 billion light-years away. LIGO’s discovery will go down in history as one of humanity’s greatest scientific achievements.

Detailed explanation-5: -The first direct observation of gravitational waves was made on 14 September 2015 and was announced by the LIGO and Virgo collaborations on 11 February 2016.