One of humankind’s greatest achievements was made on 14th Sept 2015 when the first direct detection of a gravitational wave event was made using the aLIGO observatories in Washington State and Louisana in the U.S.
![](https://scx1.b-cdn.net/csz/news/tmb/2021/thelargestev.jpg)
Source:
https://phys.org/news/2021-01-largest-ever-gravitational.html