#interstellar medium
- Astrosphere — A bubble-like region of space surrounding a star, continuously generated and maintained by the stream of plasma ejected by that star (the stellar wind) and its magnetic field. This dynamic structure acts as a protective shield against interstellar dust and high-energy cosmic rays, extending up to the astropause, where the stellar wind pressure balances that of the surrounding interstellar medium; the heliosphere is the specific astrosphere of our Sun.