High-Quality Photograph of a Black Hole



Black holes are an well-known effect that is consistent with Einstein's theory. Black holes are an extremely dense region of space where even light cannot escape. The premise of this phenomena is that a massive object bends space-time. If that massive object was extremely dense, it would ultimately bend space-time so that the walls of the dent are vertical. If a light beam is traveling and encounters the black hole, it will be bent at a consistently increasing angle so that it loops back upon itself and continues circling. It is now trapped. Objects of mass can be caught in the same way. When they spiral to the center they will be crushed to extreme density.





Swartzschild Radius
Formula

A black hole is formes when a star collapses to a diameter equivelant to or past its Swartzschild Radius. The Swartzschild radius is a ratio of a spherical object's mass to its radius. The formula(left): Rs is the Radius, G is Gravitational Constant, m is the mass of the object , and c  is the speed of light in a vaccum. To put this in proportion,  if the earth were to become a black hole, the mass would have to be contained within a 9 millimeter radius. However most black holes are not quite as small. The chart below shows a few examples of their massive size:

sincerely,

Space Cadet