The outermost edge of the heliosphere is called the heliopause. The heliosheath is the region of the heliosphere beyond the termination shock. Outside the heliosphere, this solar plasma gives way to the interstellar plasma permeating our galaxy. Both regions lie beyond the heliosphere and in interstellar space. When the interstellar wind hits the heliosphere it slows and creates a region of turbulence. Missions that reach the interstellar medium or leave the heliosphere. The wall is composed of interstellar material interacting with the edge of the heliosphere. How well the heliosphere shields the Solar System from cosmic rays is poorly understood. This field extends throughout the Sun's equatorial plane in the heliosphere. Heliophysics combines the science of the Sun, corona, heliosphere and geospace. Pioneer 10 is roughly at the outer edge of the heliosphere in 2019. The southern hemisphere of the Solar System's heliosphere is being pushed in. The heliotail is the tail of the heliosphere, and thus the Solar System's tail. In July 2013, IBEX results revealed a 4-lobed tail on the Solar System's heliosphere. The Sun moves through the heliosphere at .