The Sun's gravitational influence extends up to about 1-2LY, beyond that the rest of the galaxy would have a stronger tug on things. From wikipedia: "As of Nov

The Sun's gravitational influence extends up to about 1-2LY, beyond that the rest of the galaxy would have a stronger tug on things. From wikipedia: "As of November 12, 2010, Voyager 1 was about 115.251 AU (17.242 billion km, or 10.712 billion miles) or 0.002 of a light-year from the Sun" The solar system does not end at the heliopause, lots of things still orbit farther out.