This is a very well written account of the development of black hole physics. It is written for the general audience, and no mathematical formulae are involved. It's main focus is on the history of this branch of physics more than on the actual physics itself. As Marcia Bartusiak discusses the topic of the centenary of the general theory of relativity she covers the history of black holes, from lsaac Newton up to date, and all in just over 200 pages. She introduces the topic step by step, the way astronomers discovered it, from white dwarf stars and neutron stars to black holes themselves, via supernovae and pulsars. This is an easy read that provides insight into the way that scientists work and think. I was surprised to find out who really was the first person to use the term in an astronomical context.
The black hole is one of the most mysterious objects in the universe, a source of fascination for many wanna be astronomers. The history of an idea, the concept of a black hole made possible, theoretically, by Albert Einstein's general theory of relativity. For those interested in black holes and their reluctant acknowledgement that they existed, given in the late twentieth century, this book the book for you. As Marcia Bartusiak discusses in the book It took that long to verify their existence because regular (optical) telescopes could not see them. Radio and/or X-ray telescopes were needed to pinpoint the attendant energy associated with matter-hungry black holes. Black hole research reinvigorated interest in Einstein' general theory of relativity. "After the flurry of excitement in 1919," Bartusiak writes, "when a famous solar eclipse measurement triumphantly provided the proof for Einstein's general theory of relativity, the noted physicist's new outlook on gravity came to be largely ignored. Isaac Newton's take on gravity worked just fine in our everyday world of low velocities and normal stars, so why be concerned with the miniscule adjustments that general relativity offered?" General relativity had no practical use and, in 1955, when Einstein died, "general relativity was in the doldrums."
Roy Kerr, a mathematical physicist advanced the study of black holes by finding a way to refashion Einstein's equations to handle the rotation of a star. "The rotating object [in his solution] was dragging space-time around with it," says Bartusiak, "like the cake batter that circulates in the bowl around a whirling beater."Then Stephen Hawking, of A Brief History of Time fame,decided to look at the black hole from the perspective of an atom. His mathematical approach led to the discovery "that all black holes - spinning or not - would be radiating" energy Hawking announced his discovery in February 1974. Bartusiak adds, "In applying the laws of quantum mechanics to a black hole, Hawking found that black holes create and emit particles as if they were hot bodies. As a consequence,the black hole slowly decreases in mass and eventually disappears in a final blast!" Besides this startling breakthrough, it was found that the temperature of a black hole was not zero at all, although it is close to zero - less than a millionth of a degree above absolute zero. The temperature of the radiation leaving the black hole is now known as "Hawking radiation." And that's where we stand today, with physicists trying to unify the world of quantum mechanics (using the perspective of the atom) with that of general relativity (leveraging the perspective of space-time). And now that gravity waves, as Einstein had predicted, have been discovered (and subsequent to the release of this book), theorists can re-focus their energies to describe a theory consistent with this latest experimental result, with the hope of finally finding the theory of everything. There is no doubt that black holes will be at the center of this unifying work.