There’s a planet out there somewhere. Fairly close, I’d guess. A freewheeling planet, not tied to any sun, although I gather that it could insert its… - Clifford D. Simak

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There’s a planet out there somewhere. Fairly close, I’d guess. A freewheeling planet, not tied to any sun, although I gather that it could insert itself into a solar system any time it wishes.” “That would take some doing. It would mess up the orbits of all the other planets.” “Not necessarily,” said Maxwell. “It wouldn’t have to take an orbit in the same plane as the other planets. That would hold down the effect of its being there.