Jim Kaler is Professor Emeritus of Astronomy at the University of Illinois. He has published over 100 papers on the later stages of stellar evolution and has written more than a dozen books on stars, ranging from textbooks to popular books for general readers. His book The Cambridge Encyclopedia of Stars is a standard reference on stellar astronomy.
This book reviews our current understanding of cluster merging from an observational and theoretical perspective, and is appropriate for both graduate students and researchers in the field.
The authors outline how their positions have further diverged on a number of key issues, including the spatial geometry of the universe, inflationary versus cyclic theories of the cosmos, and the black-hole information-loss paradox. Though much progress has been made, Hawking and Penrose stress that physicists still have further to go in their quest for a quantum theory of gravity.