We literally took pictures of supermassive black holes, can see black holes eating stars, have the math figured out pretty well and we can see black hole collisions with gravitational wave detectors due to their rippling effect on the fabric of our space-time.
We literally took pictures of supermassive black holes, can see black holes eating stars, have the math figured out pretty well and we can see black hole collisions with gravitational wave detectors due to their rippling effect on the fabric of our space-time.