Circumplanetary refers to anything that is associated with or occurring in the vicinity of a planet. Some synonyms for the word include planetary, astrological, celestial, astronomical, and stellar. These words all convey the idea of something that is related to or connected with a celestial body like a planet or star. Other possible synonyms might include orbital, interplanetary, or satellite, as each of these words implies a relationship with a celestial object or system. Regardless of the exact wording used, it is clear that the concept of circumplanetary refers to a larger idea of celestial bodies and the phenomena that occurs in their proximity.