noun
trans-Neptunian object; TNO
Technical term in astronomy for any minor planet or dwarf planet orbiting the Sun beyond Neptune. Kuiper belt objects, scattered disc objects, and Oort cloud objects are also used.
冥王星は太陽系外縁天体の一つに分類される。
Pluto is classified as one of the trans-Neptunian objects.
太陽系外縁天体の観測は、太陽系形成の手がかりを与える。
Observation of trans-Neptunian objects provides clues to the formation of the solar system.
Compound of 太陽系 (solar system), 外縁 (outer edge), and 天体 (celestial body). A direct translation of the English term 'trans-Neptunian object'.