How does a quasars differ from other celestial bodies?

Many activities are occurring in the nucleus of a galaxy, most likely as a result of an active black hole consuming stars. These galaxies are so old and distant that only their nuclei are visible, leading astronomers to refer to them as quasi-stellar objects, or quasars. From photographs, they resemble stars.

Different from other celestial bodies, quasars have extremely high luminosities and are among the most distant objects in the universe. They also exhibit rapid variability in their emissions over relatively short timescales. Furthermore, quasars are frequently associated with galaxies undergoing active galactic nucleus (AGN) activity, where intense radiation and energy are emitted from the central regions of the galaxy. Quasars are highly energetic and distant celestial objects that emit massive amounts of energy, including light, radio waves, and X-rays. They are powered by supermassive black holes at their centers, which consume surrounding matter.