The event horizon is the boundary in spacetime beyond which events cannot affect an outside observer. It is the point of no return for anything that enters it.

The Schwarzschild radius is the radius of the event horizon of a black hole. It is the radius of the sphere within which nothing, not even light, can escape from the black hole's gravitational pull.

The singularity at the center of a black hole is a point of infinite density, gravity, and spacetime curvature. It is a point where the laws of physics, as we currently understand them, break down.

Dark matter is a hypothetical type of matter that does not emit or reflect light. It is thought to make up most of the universe and is responsible for the formation of galaxies and stars.

The evidence for dark matter comes from a variety of sources, including the rotation curves of galaxies, the gravitational lensing of light, and the cosmic microwave background radiation.

The nature of dark matter is still unknown. There are a number of theories about what it might be made of, but none of them have been confirmed.

Dark matter is thought to make up about 27% of the universe, with ordinary matter making up only about 5%.

There is no known relationship between black holes and dark matter. They are two separate and distinct phenomena.

Black holes are too far away to be observed directly, and dark matter does not emit or reflect light. This makes it very difficult to study these objects.

Future research in the study of black holes and dark matter will focus on developing new technologies to observe these objects and developing new theories to explain their nature.

The event horizon is the boundary in spacetime beyond which events cannot affect an outside observer. It is the point of no return for anything that enters it.

The Schwarzschild radius is the radius of the event horizon of a black hole. It is the radius of the sphere within which nothing, not even light, can escape from the black hole's gravitational pull.

The singularity at the center of a black hole is a point of infinite density, gravity, and spacetime curvature. It is a point where the laws of physics, as we currently understand them, break down.

Dark matter is a hypothetical type of matter that does not emit or reflect light. It is thought to make up most of the universe and is responsible for the formation of galaxies and stars.

The evidence for dark matter comes from a variety of sources, including the rotation curves of galaxies, the gravitational lensing of light, and the cosmic microwave background radiation.