Scientists detect tones in the ringing of a newborn black hole for the first time

If Albert Einstein’s theory of general relativity holds true, then a black hole, born from the cosmically quaking collisions of two massive black holes, should itself “ring” in the aftermath, producing gravitational waves much like a struck bell reverbates sound waves. Einstein predicted that the particular pitch and decay of these gravitational waves should be a direct signature of the newly formed black hole’s mass and spin.
Read more: http://news.mit.edu/2019/ringing-new-black-hole-first-0912?source=Snapzu