yellow spot surrounded by three concentric light-blue ellipses labeled from inside to out: Saturn, Uranus and Neptune. A grey ellipse labeled Pluto overlaps Neptune's ellipse. Four colored lines trails outwards from the central spot: a short red line labeledVoyager 2 traces to the right and up; a green and longer line labeled Pioneer 11 traces to the right; a purple line labeled Voyager 1 traces to the bottom right corner; and a dark blue line labeled Pioneer 10traces left