Heliosphere
region of space dominated by the Sun / From Wikipedia, the free encyclopedia
The heliosphere is the magnetosphere, stellar wind bubble and outermost atmospheric layer of the Sun.
The heliosphere is the cavity made by the Sun in the interstellar medium. Almost all of the material in the heliosphere comes from the Sun itself.
For the first ten billion kilometres of its radius, the solar wind travels at over a million kilometres per hour.[1][2] It slows down before finally stopping altogether. The point where the solar wind slows down is the termination shock; the point where the interstellar medium and solar wind pressures balance is called the heliopause; the point where the interstellar medium, travelling in the opposite direction, slows down as it collides with the heliosphere is the bow shock.