What is astrosphere madeup of on earth?

The astrosphere, often referred to in the context of the heliOSphere, is the bubble-like region of space influenced by the solar wind emitted by the Sun. On Earth, it is not a physical structure but rather a concept that encompasses the solar wind's interaction with the interstellar medium. It extends well beyond the orbit of Pluto and protects the solar system from cosmic radiation. The astrosphere defines the boundary between solar and interstellar environments, creating a shield for the planets within it.