Above is a simulation of the gravitational lensing of two orbiting black holes by the SxS group or research scientists.  I stumbled upon this site (Simulating Extreme Spacetimes) , which was put together by multiple institutions for research on black holes, neutron stars  and other extreme events ‘To better understand Relativity and the physics of exotic objets in the Cosmos.‘  The work put together here is information rich, especially for the hard core Sci-Fi writer.  Explore their Glossary, simulations and a favorite, Sounds.   Surf their site for the plethora of links to make your writing a good read.

This is a great one-stop shopping site for my works in progress