This is meant to portray the view from the surface of Pluto.   The large body immediately in front is meant to be Charon, Pluto's largest moon and further away is another body that at the time was new to science and had no name.   In fact, Charon is probably a bit larger in the sky than this image demonstrates.  The two bodies rotate around a common center of gravity while the 2 other bodies, Nix and Hydra,  rotate around them.