Interstellar Visitors: Oumuamua, Comet Borisov, and Comet 3I/ATLAS and the Ejection of Planetary Material Across Star Systems

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Interstellar objects are bodies that originate outside the solar system and are ejected by planet-making processes in other stars, as shown by ‘Oumuamua, 2I/Borisov, and 3I/ATLAS.

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britannica.com

Interstellar object | Definition, Oumuamua, Borisov, & Facts | Britannica

Interstellar object, an object that has entered the solar system from interstellar space. Three such objects have been observed: ‘Oumuamua (discovered in 2017), Comet Borisov (discovered in 2019), and Comet 3I/ATLAS (discovered in 2025). ‘Oumuamua was discovered on October 19, 2017, by the