Description: Quasar variability refers to the changes in brightness of a quasar over time, which can provide information about its structure. Quasars, which are active galactic nuclei powered by supermassive black holes, exhibit fluctuations in luminosity that can occur on timescales ranging from days to years. These variations are crucial for astronomers, as they allow for inferences about the dynamics of the material orbiting the black hole and the nature of the quasar itself. Variability can be caused by several factors, including the interaction of matter in the accretion disk, the presence of gas clouds that absorb or reflect light, and the activity of the black hole itself. Furthermore, studying quasar variability aids in understanding galaxy evolution and the role of black holes in the universe. In summary, quasar variability is not only a fascinating phenomenon in itself but also a valuable tool for unraveling the mysteries of the cosmos.
