What does it mean?
Einstein’s Field Equation – describes gravity as the curvature of space-time dependent on the mass that exists in it.
Singularity – In this context, singularity is a place in space where mass density and gravitational force become infinite.
Black Hole – A region of space within which the force of gravity (space-time curvature) is so strong that nothing, not even light, can escape from it.
In human speak please!
Contrary to popular belief, black holes do not suck in things like a vacuum cleaner. If our Sun were to suddenly turn into a black hole, all the planets will continue orbiting it in exactly the same paths they currently follow. Of course, we would lose our source of light and heat, ending life as we know it.
Karl Schwarzschild (October 9, 1873 – May 11, 1916), a German scientist who did important work in the physics of photography as well as formulated the first exact solutions to Einstein’s General Relativity equations. He was fighting in World War I when he mailed Einstein his paper, which predicted the existence of black holes. Schwarzschild died of illness, not injury, a few months later without ever realizing the impact that his paper would have on the physics and astronomy communities.
Is that all?
Karl Schwarzschild – Biography of Karl Schwarzschild.