This is what happens when Two Black Holes Collide.
This is the animation of the final stages of a merger between two black holes. What is particularly interesting about this animation is that it highlights a phenomenon known as Gravitational Lensing.
What is Gravitational Lensing?
Mass bends Light. What?
Yeah, mass can bend Light. The gravitational field of a really massive object is super strong. And this causes light rays passing close to that object to be bent and refocused somewhere else.
The more massive the object, the stronger its gravitational field and hence the greater the bending of light rays – just like using denser materials to make optical lenses results in a greater amount of refraction.
Here’s an animation showing a black hole going past a background galaxy.
This effect is one of the predictions of Einstein’s Theory of General Relativity