The boundaries of the Solar System are not clearly defined, but they generally extend to the Heliosphere, which is the region influenced by the Sun's solar wind. This area stretches about 100 astronomical units (AU) from the Sun, where the solar wind meets the interstellar medium. Beyond the Heliosphere lies the Oort Cloud, a theoretical shell of icy objects that may extend up to 100,000 AU from the Sun. This region is thought to be the source of long-period comets and marks the outer limits of the Solar System's gravitational influence.