The main focus of this book is on the interconnection of two unorthodox scientific ideas the
varying-gravity hypothesis and the expanding-earth hypothesis. As such it provides a
fascinating insight into a nearly forgotten chapter in both the history of cosmology and the
history of the earth sciences.The hypothesis that the force of gravity decreases over cosmic
time was first proposed by Paul Dirac in 1937. In this book the author examines in detail the
historical development of Dirac's hypothesis and its consequences for the structure and history
of the earth the most important of which was that the earth must have been smaller in the
past.
