Gravitational field from a black hole merger distorted spacetime in waves with power about 50 times stronger than all the shining stars and galaxies in the observable universe.
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Gravitational Waves Discovered from Colliding Black Holes
https://www.scientificamerican.com/article/gravitational-waves-discovered-from-colliding-black-holes1/
The LIGO experiment has confirmed Albert Einstein’s prediction of ripples in spacetime and promises to open a new era of astrophysics