GENERAL KNOWLEDGE

Detailed explanation-1: -A black hole is a region in space where the pull of gravity is so strong that nothing, not even light, can escape. Its boundary is known as the event horizon.

Detailed explanation-2: -Karl Schwarzschild was a German physicist, who not only served in the First World War, But at the same time managed to work out the exact distance from the center of a black hole, to the point where gravity becomes so strong that even light can’t escape. This is the point of no return, also known as the event horizon.

Detailed explanation-3: -A coordinate singularity, which is the event horizon-the black hole’s outer boundary, and a gravitational singularity, which represents the heart of the black hole. Schwarzschild’s solution gave the coordinate singularity and thus the event horizon a solid location around a black hole known as “Schwarzschild radius."

Detailed explanation-4: -: the surface of a black hole : the boundary of a black hole beyond which nothing can escape from within it.