Schwarzschild also presented a formula that calculated the size of an event horizon-known as the Schwarzschild radius. This boundary was named the event horizon. In his work published shortly before his death in 1916, Schwarzschild also explained that a singularity was surrounded by a spherical gravitational boundary in spacetime that forever trapped anything that ventured too close to it, nothing can escape from inside it, scientists refer to it as “the point of no return”. If an object have sufficiently compact mass then it can deform spacetime to form a strange but a fascinating thing called black hole, a region of spacetime with extreme density and zero-volume but all of its mass as a singularity - I know its hard to imagine something like black holes, don’t worry, even the thinkers of that period could not imagine it, the idea of a singularity troubled many scientists, even Einstein himself, he argued vigorously that black holes were incompatible with reality. Significantly, Schwarzschild’ solution provided support for an extreme situation about the effects of severely compressed matter on gravity and energy. The first complete solution to Eintstein’ unfinished equations was found by a theoretical physicist named Karl Schwarzschild in 1916. It took him years to work out the math to find the solutions to his own equations, but they were only an approximate solution. When Einstein developed relativity theory, he found a new way to describe gravity.
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