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.