outer planet
- n (astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto)
outer planet :
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- New Moon Discovered Around Neptune in Old Hubble Images
Blue and gassy, the outer planet Neptune hosted 13 known moons until today. Now, there are 14. Announced July 15, the moon known as S/2004 N1 is so small and faint that it escaped detection by NASA's Voyager 2 spacecraft, which flew by Neptune in 1989.
July 15, 2013 - Wired News