Fr.: objet sous-stellaire
trans-Neptunian object (TNO)
Fr.: objet trans-neptunien
A member of a class of objects in orbit around the Sun at a larger distance than the distance between Neptune and the Sun. This includes several → dwarf planets, such as → Eris, → Pluto, and many small solar system bodies.
unidentified flying object (UFO)
barâxt-e parande-ye nâ-idânidé, padide-ye havâ-fazâyi-ye nâ-idânidé
Fr.: Objet Volant Non Identifié (OVNI)
Any flying object or phenomenon that cannot be identified by the observer.
young stellar object (YSO)
barâxt-e setâreyi-ye javân
Fr.: objet stellaire jeune
Any star that has evolved past the → protostar stage, but has not yet arrived on the → main sequence. There is a variety of YSOs depending on their age, mass, and environment, including → Herbig stars, → T Tauri stars, and, in general, compact infrared sources embedded in molecular clouds.
→ young; → stellar; → object.