(a.) Between or among the stars; as, interstellar space.

Cynthian anagalactic asteroidal astral astrologic astrologistic astrologous astronomic astrophysical celestial circumplanetary cislunar empyreal empyrean equinoctial extragalactic galactic heavenly heliacal intercosmic interplanetary intersidereal lunar lunary lunate lunular lunulate meteoric meteoritic nebular nebulose nebulous planetal planetarian planetary planetesimal semilunar sidereal solar sphery star-spangled star-studded starry stellar stellary terrestrial uranic zodiacal