American Heritage® Dictionary of the English Language, Fourth Edition
- n. Any of the four planets, Jupiter, Saturn, Uranus, and Neptune, with orbits outside that of Mars.
- n. astronomy Any planet of the Solar System whose orbit is located beyond the asteroid belt, i.e., any of Jupiter, Saturn, Uranus, or Neptune.
- n. (astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto)
“From Zanzibar Twenty-a small outer planet five thousand million miles from a minor sun-in the Zanzibar system, thirty light years from Earth and thus about twenty from the carrier, a stream of rock and minerals and dirt dug from the soil, loosened by robot mining equipment and funneled through the box, spouted across space and into the box aboard the carrier and was deflected into the fuel bins.”
Looking for tweets for outer planet.