After the Pioneer, Voyager and New Horizons spacecraft complete one orbit of the Milky Way (in approx. 230-250 million years or one "galactic year"), how close will they then be to our solar system?
(Editing my question for clarification) The reason for asking the question is to understand whether these spacecraft that are now in orbit around the center of the galaxy will behave analogously to an object that was thrust away from the ISS and then meets up with the ISS exactly one orbit later. I am assuming that the gravitational pull of the galactic core will prevent the spacecraft from rising above or below the galactic plane for ever and that they will be in a similar orbit to the solar system, just inclined to it. Is that correct?