I can provide some general information about the brightness of astronomical objects like stars and quasars. Stars vary widely in their brightness. While some stars are relatively dim, others are incredibly luminous. The Milky Way galaxy contains hundreds of billions of stars, and their combined light contributes to the overall brightness of our galaxy.
Quasars, on the other hand, are among the most luminous objects in the universe. They are extremely distant and active galactic nuclei powered by supermassive black holes at their centers. Quasars emit tremendous amounts of energy across the electromagnetic spectrum, including visible light, X-rays, and radio waves. Their brightness can surpass that of entire galaxies, making them among the most luminous objects known.
If there is more recent information about the object AT2021lwx that I am not aware of, I apologize for the lack of information. Please provide more context or details if you have them, and I'll do my best to assist you.