Could a solar systems gravity catch and hold a passing planet. Would the passing planet change the position of all the other planets in that solar system or would the planet just carry on and pass through that solar system.
Could the gravity of that solar system put the wondering planet into a stable orbit around its sun without changing the orbit position of other planets in that solar system. would all planets in that solar system now need to find a new orbits around its sun.
Would the gravity of the new planet affect all planets in that solar system or would it be down to the solar systems sun to determine the positions of planets.?