A black hole is a region of spacetime where gravity is so strong that nothing, not even light, can escape. The boundary of this region is called the event horizon.

A wormhole is a hypothetical tunnel or passage through spacetime that connects two distant points in the universe. It is a theoretical concept that has not been proven to exist.

The event horizon is the boundary of a black hole from which nothing, not even light, can escape. It is the point of no return.

A singularity is the point of infinite density and gravity at the center of a black hole. It is a region where the laws of physics break down.

Albert Einstein proposed the theory of general relativity, which laid the foundation for understanding black holes.

Cygnus X-1 was the first black hole candidate discovered, which was later confirmed to be a black hole.

Sagittarius A* is the name of the supermassive black hole at the center of our galaxy, the Milky Way.

M87* is the name of the black hole at the center of the galaxy M87, which was the first black hole to be directly imaged.

Accretion is the process by which matter and energy fall into a black hole.

Evaporation is the process by which a black hole loses mass and energy.

Spaghettification is the process by which an object is stretched and compressed as it approaches a black hole.

Hawking Radiation is the theoretical radiation emitted by black holes due to quantum effects.

A wormhole is a hypothetical bridge between two different regions of spacetime, allowing for faster-than-light travel.

There is no known hypothetical process by which a wormhole could be created.

The main challenge in studying black holes and wormholes is the lack of observational data.