Jisho

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たいようけいがいえんてんたい 太陽系外縁天体
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Noun
1. trans-Neptunian object; transneptunian object; TNO​Astronomy
Wikipedia definition
2. Trans-Neptunian object​A trans-Neptunian object (TNO; also written transneptunian object) is any object in the Solar System that orbits the Sun at a greater average distance than Neptune. The first trans-Neptunian object to be discovered was Pluto in 1930. It took until 1992 to discover a second trans-Neptunian object, (15760) 1992 QB1, with only the discovery of Pluto's moon Charon in 1978 before that. Now over 1200 trans-Neptunian objects appear on the Minor Planet Center's List Of Transneptunian Objects.
Read “Trans-Neptunian object” on English Wikipedia
Read “太陽系外縁天体” on Japanese Wikipedia
Read “Trans-Neptunian object” on DBpedia

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