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Thousands of Interstellar Objects Predicted to Reside in Solar System's Oort Cloud
Key points
- Thousands of interstellar objects may reside in the Oort cloud.
- The Sun likely collected these objects during close encounters with other stars.
- Models predict object exchange during stellar flybys.
- The Oort cloud is too distant for current observation of these objects.
Interstellar Objects in the Solar System
Over the past decade, three interstellar objects have been observed passing through our solar system. These objects travel at high speeds, allowing them to escape the Sun's gravitational pull and typically remain visible for only weeks before departing the solar system.
New Study Predicts Oort Cloud Residents
A new study indicates that some interstellar objects may not leave the solar system but instead reside in the Oort cloud, its outermost region. Researchers led by Sean Raymond of the Bordeaux Astrophysics Laboratory suggest that the Sun has collected thousands of non-native objects from other star systems over its 4.6-billion-year history.
Stellar Flybys and Object Exchange
The study's models predict that during close encounters with other stars, known as stellar flybys, the Sun exchanged objects with these systems. The Sun is estimated to have had at least one or two such encounters, which could account for a significant portion of the captured ISOs currently in the solar system. This process is likely common, with most stars hosting Oort clouds populated by captured ISOs.
Observational Challenges
The Oort cloud, composed of frozen comet-like objects, extends approximately three light-years from the Sun. Its vast distance currently prevents direct observation of these predicted interstellar objects.
✨ This summary was generated by AI from the outlets' reporting listed below. It is not independently verified and may contain errors — check the original sources. How BrevFeed works →
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Reporting from
A new study suggests that thousands of interstellar objects (ISOs) may be present in the Oort cloud, the outermost region of our solar system. This prediction is based on models of stellar flybys, where the Sun exchanged objects with other star systems over its 4.6-billion-year lifespan, and it changes the understanding of the solar system's composition.