interplanetary space

Interplanetary space is that part of outer space between planets in a solar system and its local star(s), many of which are binaries. Around any one planet, "interplanetary" space begins in the broad region where any atmosphere, magnetic field and moons end, ceding dominance to the local star; in our case, the Sun. The diffuse outer boundary of our interplanetary space is characterized by the heliopause, where the solar wind meets the interstellar medium, and by the Oort cloud, the region where comets originate.
See more at Wikipedia.org...

Noun
1. the part of outer space within the solar system
(hypernym) region, part
(hyponym) interplanetary medium
(part-holonym) outer space
(part-meronym) asteroid belt