LIGO experiment confirmed one of the predictions of :

The LIGO (Laser Interferometer Gravitational-Wave Observatory) experiment provided the first direct observation of gravitational waves, confirming a major prediction made by Albert Einstein in 1916 as part of his General Theory of Relativity.

• The Prediction: Einstein’s theory proposed that gravity is not a force but a curvature of space-time caused by mass. He predicted that massive accelerating objects (like merging black holes) would create ripples in this fabric, known as gravitational waves.
• The Discovery: In September 2015, LIGO detectors in the US sensed these minute distortions caused by the collision of two black holes 1.3 billion light-years away.
• Significance: This discovery proved the final unconfirmed piece of the General Theory of Relativity and earned the lead scientists the Nobel Prize in Physics in 2017. It allows scientists to observe the universe using gravity instead of just light.