Hey Space Placers!
The 4th detection of gravitational waves from a black hole pair merging took place in August 2017. Unlike the previous three detections by two US based gravitational wave observatories in Washington state and Louisiana, this event was also seen by a new gravitational was observatory in Italy.
At some point we will have the detection of a neutron star merging event - maybe with a black hole or another neutron star. That will be something.......not that merging black holes are dull ;-)
Sky Guy in VA