While everyone thought matter in a black hole was gone forever, Stephen Hawking in 1974 predicted that black holes could radiate energy away (Hawking radiation). As the singularity accumulates more and more matter, the size of the black hole’s event horizon increases proportionally. Once inside the black hole’s event horizon, matter will be torn apart into its smallest subatomic components and eventually be squeezed into the singularity. For all practical purposes the matter has disappeared from the universe. When matter falls into or comes closer than the event horizon of a black hole, it becomes isolated from the rest of space-time. Although the matter at the center is really a singularity, we say it is a black hole the size of the event horizon distance. At a distance less than the event horizon radius, everything disappears. This radius is the point or distance from the singularity at which light can still escape from the region. This Schwarzschild radius, also called the event horizon, is proportional to the mass of the black hole, M, and may be written as Rs = (1.48 x 10-27) times M. In 1916, German astrophysicist Karl Schwarzschild derived an equation for the radius of a black hole. For this reason considerable time and effort is being spent studying this strange phenomena. Near singularities the known laws of physics break down. Since no light can escape we say the region is black hence the name black hole. The effect of this point on space-time is to distort it so that nothing can escape from the immediate region, not even light. This point has infinite mass and density and is infinitely small. The matter continues to collapse to a point that is known as a singularity. With sufficient mass, gravitational attraction within the matter itself overcomes all other forces and matter begins to collapse. To form a black hole, a lot of matter is needed and must be concentrated in a small amount of space. Similarly, a mass distorts or bends space. With a lot of mass, say a lead bowling ball, a 'hole' forms on the surface of the bed. Now place a bowling ball on it, the surface is distorted or bent. Relativity showed that gravity is related to the curvature of space and that a black hole is a place where the curvature becomes so extreme that a 'hole' forms. However it was not until Einstein published his theory of general relativity in 1915 that the black hole theory really received wide attention. Newton’s theories first appeared in his famous book, 'The Principia.' In the 1700’s scientists speculated on the existence of massive objects with tremendous gravitational forces which today we call black holes. The force of gravity is created by mass and gravity always attracts other mass. Isacc Newton determined in the late 1600’s that the force of gravity was due to matter or more specifically mass. Where does the matter go when it is pulled into a black hole? August 2001 Vocatio Center for Life Calling and Career.Office of Student Leadership & Engagement.

Inside a black hole