In early 20th century America there were wealthy men who were willing to donate money for bigger and bigger telescopes. Astronomers had been looking at spiral nebulae. With the larger and more powerful telescopes it became obvious that those spiral nebulae were actually spiral galaxies just like our own Milky Way. It was also determined that the earth's sun was not in the center of the Milky Way. So we had a double demotion - the earth was not in the center of this galaxy and the Milky Way was not even the only galaxy.
In addition to the more powerful telescopes the cosmologists had another powerful new tool, color spectrum analyzers. But in addition to the tools there were the personalities and Bartusiak gives them all some time. While everyone has heard of Edwin Hubble who has an orbiting space telescope named after him how many have heard of James Keeler who was both a master with spectroscope but helped make the reflecting telescope the tool of choice. And there was Henrietta Leavitt who's study of Cepheid variables made it possible for male astronomers to determine the size of the universe. There are of course many more - some hardly known but most forgotten by history.
Now if you still think the earth is 6,000 years old and that the sun orbits the earth this book is not for you. But if you are interested in the history of scientific thought this is a wonderful book. Bartusiak is a wonderful science writer and this book is the result of extensive research to find the important players that have been forgotten. Even in serious scientific circles there are personality conflicts, egos and competition and Bartusiak makes that a part of the story.