The Oort Cloud is a vast, spherical shell of icy objects that surrounds our solar system, extending from about 2,000 to 100,000 astronomical units from the Sun. It is believed to be the source of long-period comets that enter the inner solar system, providing valuable insights into the early solar system's formation and evolution. Named after the Dutch astronomer Jan Oort, the Oort Cloud is not directly observable, but its existence is inferred from the behavior of comets. Understanding this distant region helps astronomers learn more about the dynamics of our solar system and the potential for discovering new celestial bodies.