Accretion processes refer to the mechanisms by which celestial bodies such as stars, planets, and black holes gather mass from their surrounding environment. This process typically involves gravitational attraction and the accumulation of material from a surrounding disk or cloud of gas and dust. Accretion plays a crucial role in the formation and evolution of various astronomical objects, and studying these processes can provide valuable insights into the dynamics and evolution of the universe. Researchers often investigate accretion in various contexts, such as star formation, planet formation, and the growth of supermassive black holes in the centers of galaxies.