They are so dark they absorb almost every bit of light from any star and receive no photon velocity momentum or electromagnetic radiation.
The momentum that a planet receives or does not receive from photons is negligible for its orbit.
These dark masses are extremely high in mass and do not interact with light like other planets and moons.
A dark object very much interacts with light: it absorbs light. An object that does not interact with light would be transparent, not dark.
I believe different levels of light interaction on a mass causes planets to move away from stars or stay at bay.
Planetary orbits are governed by gravitational effects. The effect of light interaction on orbits is negligible.
Finally, none of this has anything to do with planets in orbit or not. Planetary orbits are due to gravitation.
Only another collision from a celestial body can interfer with the direction they are heading they outweigh most of the competition so distraction is rare.
Indeed, the only force massive enough to alter the orbit of a planet would be another planet, either hitting it full force, or passing closely thus altering its angular momentum. You'd need an awful lot of this to cause a planet to reach a solar system escape trajectory, however!
And it has nothing to do with colour or photon interaction. It's all about mass.
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