The 2 Voyager probes sent into space since 1977 are now in the solar system's heliosphere having passed the Termination Shock point between late 2003(Voyager1) and late 2007(Voyager2) at roughly 8 billion miles away from the Sun. What they have revealed is that our solar system is egg-shaped rather than circular, especially where the heliosphere is concerned, which is the huge magnetic field around the solar system as it moves through and brushes against the thin gas of interstellar space.
Amazingly, the cross section of a common egg(see egg diagram) accurately depicts the shape and structure of our solar system, with the yolk containing most of the planets and the yolk's outer border equating with the Termination Shock point. The white of the egg and its shell equate with the heliosphere.
Some of the outermost planets such as perhaps Eris and definitely Sedna exit this yolk or bubble. Also, it may very well be that our sun's mysterious binary or real Planet X travels along or defines the heliosphere's egg-shaped border.