Gravitational waves rippling from black hole merger could help test general relativity 

 Gravitational waves have been uncovered from a massive black hole merger that shows the resultant black hole settling into a spherical shape for the first time, helping test Einstein’s theory of general relativity. 

https://cdn.mos.cms.futurecdn.net/zbfRN6hT47MPCQBNTsNt8o.jpg

https://www.space.com/black-hole-ligo-merger-general-relativity-gravitational-waves