The heliosphere is a vast, bubble-like region of space that…

The heliosphere is a vast, bubble-like region of space that surrounds the sun and is created by the outward flow of the solar wind. The solar wind is a stream of charged particles, primarily electrons and protons, that are constantly ejected from the sun's upper atmosphere (the corona).
As the solar wind expands outward from the sun, it creates a boundary called the heliopause, which separates the solar wind from the interstellar medium (the gas and dust that exists between stars). Inside the heliopause, the solar wind dominates the space environment, and this region is called the heliosphere.
The heliosphere extends well beyond the orbits of the planets in our solar system. It is estimated to have a radius of about 90 to 120 astronomical units (AU), where 1 AU is the average distance between the Earth and the sun. The shape of the heliosphere is not perfectly spherical; it is thought to be somewhat compressed on the side facing the sun's motion through the galaxy and elongated on the opposite side, forming a "tail" structure.
The heliosphere acts as a protective bubble, shielding the solar system from high-energy galactic cosmic rays and interstellar medium. It is a dynamic structure that varies in size and shape depending on the strength of the solar wind and the conditions in the local interstellar medium.