The heliosphere is the vast region of space surrounding the Sun, where the solar wind and the Sun's magnetic field interact with the interstellar medium. It extends far beyond the orbit of Pluto and acts as a protective bubble that shields our solar system from the harsh cosmic rays and interstellar dust. Scientists study the heliosphere to better understand its structure, dynamics, and interactions with the surrounding interstellar medium, as well as its implications for space weather and the overall environment of our solar system.