This textbook introduces the current astrophysical observations of black holes, and discusses the leading techniques to study the strong gravity region around t

Black holes are one of the most fascinating predictions of general relativity. They are the natural product of the complete gravitational collapse of matter and

X-ray observations of active galactic nuclei and black-hole binaries offer a unique laboratory for testing general relativity in the strong-gravity regime, for

One of the most exciting predictions of Einstein's theory of gravitationisthat there may exist 'black holes': putative objects whose gravitational fields are so

It is not an exaggeration to say that one of the most exciting predictions of Einstein's theory of gravitation is that there may exist "black holes": putative o