An interstellar object is a non-stellar astronomical object not in closed orbit around a stellar object. The name means an object in the space between 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 straight line. They do not have a (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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