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A 'captured' alien planet may be hiding at the edge of our solar system

A recent study suggests that while the Planet X hypothesis, proposed by Percival Lowell in the search for a giant planet beyond Neptune, is discredited, there is a small chance of planet-size bodies resting in the distant Oort cloud. The research indicates a 0.5% chance of a rogue planet from our system being present and a 7% chance of a Neptune-like planet from another solar system being captured.