The Membrane Paradigm for Black Holes
How can one picture the interaction of a hole in spacetime with the matter and fields of its environment? It is fruitful to conceive of the black hole as an electrically conducting, spheroidal membrane
The Search for Black Holes
Observations at the wavelengths of light, radio waves and X rays indicate that the X-ray source Cygnus X-1 is probably a black hole in orbit around a massive star
Gravitational Collapse
Gravity, the weakest force known, may be the agent for crushing matter out of existence. This could happen after a star collapses to a critical size, whereupon gravity overwhelms all other forces