Could the Solar System Lose a Planet to a Passing Star?:
Close stellar encounters could change the structure of our planetary system, potentially dooming Earth ...
scientificamerican.com/article/could-the-solar-system-lose-a-planet-to-a-passing-star/
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astronomical object consisting of a luminous spheroid of plasma held together by its own gravity
science of planets and other astronomical objects apparently in orbit around one or more stellar objects
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