Binary Orbit Software 
to
see how these images were generated: 

The orbits above are two stars and a planet. The yellow is largest and slowest while the turquoise has medium mass and velocity. The smaller planet is represented by the fastest moving indigo orbit. 
See
also : oscillations
in spiral galaxies 
Below are orbits that represent about 2% of a random variety of orbits around a binary system. If the star orbits one of the equal supermassive pair at precisely twice the frequency as the pair orbit each other, then the outer orbit will be perfectly stable and never reach escape velocity. Most other binary orbits are exponentially more unstable. 
A
minor orbit around a major binary pair with a ratio of 
to
see how these images were generated: 
Recent Developments  2017 AD The
Astrosling 
Gravitational Waves & General Relativity A computational analysis of the theory of gravitational waves; as expressed within Einstein’s Theory of General Relativity and the wider realm of Astrophysics. Essentially a critique, this study has been written for the purpose of explaining the unobvious challenges faced in building graphically dynamic evolutionary computer models. These models compute the theoretical functionality of gravitational waves in the celestial paradigms of solar system formation and galaxy formation. 
More
about gravity here: 