Gravitational Waves are the proof of Black Holes

Gravitational Waves are ripples in fabric of space-time.

Who Proposed Idea of Gravity Waves

The idea was proposed by french Mathematician Henry Poincaré in 1905.
Albert Einstein explained the behaviour of such waves. General Theory of Relativity states energy can be transferred in the form of gravitational radiation.

When two heavy objects merge the gravity waves are produced on the fabric of space-time as Einstein said.
It took years for scientists to accept the existence of gravity waves and gravity waves can be detected.

Detection of Gravitational Waves

Finally in 2016 Laser Interferometer Gravitational-Wave Observatory(LIGO) detected Gravity pools which were produced by the merging of two Black Holes. Detection made after 100 years of General Relativity.

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