A black hole
A black hole is a region of spacetime in which gravitational effects prevent matter and radiation from escaping beyond a defined boundary. It is associated with extreme mass density and relativistic effects.
Black holes are discussed in astrophysics, general relativity, and high-energy astronomy.
Status
Black holes are inferred through observational evidence such as gravitational effects on nearby matter and electromagnetic emissions from accretion processes. Models of their formation, structure, and behavior are continually refined.