Oh well. When Valkian language gets translated to human languages, it gets all mixed up and turns into solar system. 

Stars are suns. Suns give off solar energy. Valkians call them solar systems, without the capital s, because the entire system is bathed in solar energy from the star in the middle. =ValkLogic

If you have a problem with it, then don't read it as solar system, read it as planetary system. #ProblemSolved