A "black star" is a theoretical astronomical object that is a type of compact star. Unlike a traditional black hole, a black star is thought to be formed from collapsing matter that does not completely collapse into a singularity. Instead, it has a surface and can emit radiation, making it detectable under certain conditions. The concept of a black star is related to the study of general relativity and quantum mechanics. It challenges our understanding of gravity and the behavior of matter under extreme conditions. While black stars have not been observed, they are an interesting topic in theoretical physics and astrophysics.