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Gravitational interactions between passing objects always has the potential to disturb the orbits of the two bodies involved, but I'm unaware of any research indicating that objects have been observed to have been perturbed OUTWARD from the Kuiper Belt to the far more distant (and hypothetical) Oort Cloud. It has probably happened, at least a FEW times. But the Kuiper Belt itself is so distant that our ability to detect comet-sized objects is quite limited. And aside from the philosophical argument of "Where do new comets come from, if not from the Oort cloud?", we have precisely ZERO actual evidence that the Oort Cloud exists as postulated.

There have been intermittent speculations that a massive but dark object, perhaps a planet or a brown dwarf star, might be in a highly elliptical orbit around the Sun. This object, occasionally named "Nemesis", might perturb distant Oort Cloud and Kuiper Belt objects out of their lazy orbits and drop them into the inner solar system as comets. The idea is that this might explain some strange periodicity of mass extinctions on Earth, that we might expect at any century a withering cosmic hailstorm of deadly proportion.

But the proposed math and timetables never seems to work out, and a massive enough object should have been discovered by now.

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Q: What has forced some comets that originated in the kuiper belt outward into the Oort cloud?
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