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When Oumuamua traversed our Solar System in 2017 it was the first confirmed Interstellar Object to do so.
It's an interesting thought experiment; while Borisov and Oumuamua were smaller objects, a more massive rogue planet joining our Solar System could generate orbital chaos. It could potentially alter the course of life on Earth, though that is highly improbable.," and the authors are Edward Belbruno from the Department of Mathematical Sciences at Yeshiva University, and James Green, formerly of NASA and now from Space Science Endeavours.
Our Solar System's phase space is extremely complex and involves many moving bodies and their changing coordinates. Subtle changes in phase space coordinates can allow objects to transition between permanent capture states and weak capture states. By the same token, subtle differences in ISOs or rogue planets can lead them into these points.
An object in permanent weak capture will never escape, but will never reach a consistent, stable orbit. It asymptotically approaches the capture set without colliding with the star. In our solar neighbourhood, which extends to a radius of six parsecs around the Sun, there are 131 stars and brown dwarfs. Astronomers know that at least several of them host planets, and all of them may very well host planets we haven't detected yet.
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