File:First Known Interstellar Visitor is an “Oddball” (gemini1710b).tiff

1I/ʻOumuamua, the first confirmed interstellar object passing through the Solar System, in 2017

An interstellar object is a non-stellar astronomical object not in closed orbit around a stellar object. IThe name means an object in the sapce betwwn two stars. Such objects are so far away, that they are not locked to a star (or similar object) through gravitation. Usually they travel through space on a more or less staight line. They do not have an (usually elliptical) orbit. Typical interstellar objects are asteroids and comets.

Interstellar objects in our solar system

As of 2026, three interstellar objects have been observed transitioning our solar system.

1I/'Oumuamua transitioned in 2017
2I/Borisov transitioned in 2019
3I/Atlas transitioned in 2025

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