Accretion rates refer to the rate at which material accumulates onto a central object, typically a star or a black hole. This process of accretion plays a crucial role in the formation and evolution of celestial bodies, such as planets and galaxies. Accretion rates can vary widely depending on the properties of the central object and the surrounding environment, and are often studied in the context of astrophysics and planetary science. Researchers investigate accretion rates to better understand the mechanisms of star formation, the growth of black holes, and the formation of planetary systems. Accretion rates are typically measured in units of mass per unit time, such as solar masses per year.