outer planet
noun
: any of the planets Jupiter, Saturn, Uranus, and Neptune whose orbits lie beyond the asteroid belt
Examples of outer planet in a Sentence
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Neptune, the eighth and most distant planet from the sun, stands out among the outer planets in our solar system for its odd group of moons.
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Jacopo Prisco, CNN Money, 20 May 2026
The technology could also support missions to Neptune and Triton, long-duration probes studying outer planet moons, and future Kuiper Belt explorers traveling farther than New Horizons.
—Aamir Khollam, Interesting Engineering, 15 May 2026
In fact, in 2017 a group of astronomers proposed a different planetary definition that would include Pluto—however, their definition would also include more than a dozen moons of the outer planets as well, which seems a bit too welcoming.
—Phil Plait, Scientific American, 8 May 2026
The Milky Way's outer planets, including Saturn, Jupiter, Uranus, Neptune and Pluto, retrograde annually.
—Carlie Procell, USA Today, 25 Feb. 2026
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Jacopo Prisco, CNN Money, 20 May 2026
The technology could also support missions to Neptune and Triton, long-duration probes studying outer planet moons, and future Kuiper Belt explorers traveling farther than New Horizons.
—Aamir Khollam, Interesting Engineering, 15 May 2026
In fact, in 2017 a group of astronomers proposed a different planetary definition that would include Pluto—however, their definition would also include more than a dozen moons of the outer planets as well, which seems a bit too welcoming.
—Phil Plait, Scientific American, 8 May 2026
The Milky Way's outer planets, including Saturn, Jupiter, Uranus, Neptune and Pluto, retrograde annually.
—Carlie Procell, USA Today, 25 Feb. 2026
See All Example Sentences for outer planet
Cite this Entry
“Outer planet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/outer%20planet. Accessed 24 May. 2026.
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