How far out could a planet’s orbit be from our Sun?
Robbie Mckenzie
For a planet to orbit the Sun, it must be gravitationally bound to it, so it has to be close enough to feel the Sun’s gravity more strongly than that of any other star, and to travel slower than escape velocity from the Sun at that distance. We know that objects in the Oort Cloud, up to two light years out, orbit the Sun, so a planet at that distance likely would too.