Our asymmetrical solar system,brought to you by Voyagers 1 and 2

"NASA's Voyager 2 spacecraft has followed its twin Voyager 1 into the solar system's final frontier, a vast region at the edge of our solar system where the solar wind runs up against the thin gas between the stars.

"The solar wind is a thin gas of electrically charged particles (plasma) blown into space by the Sun. The solar wind blows in all directions, carving a bubble into interstellar space that extends past the orbit of Pluto. This bubble is called the heliosphere, and Voyager 1 was the first spacecraft to explore its outer layer, when it crossed into the heliosheath in December 2004.

"However, Voyager 2 took a different path [into] this region, called the heliosheath, on August 30, 2007. Voyager 2 crossed the heliosheath's boundary, called the solar-wind termination shock, about 10 billion miles away from Voyager 1 yet almost a billion miles closer to the Sun. [This] confirmed that our solar system is 'squashed' or 'dented' -- that the bubble carved into interstellar space by the solar wind is not perfectly round. Where Voyager 2 made its crossing, the bubble is pushed in closer to the Sun by the local interstellar magnetic field."