Varying Gravity

Dirac’s Legacy in Cosmology and Geophysics

  • Helge Kragh

Part of the Science Networks. Historical Studies book series (SNHS, volume 54)

Table of contents

  1. Front Matter
    Pages i-xi
  2. Helge Kragh
    Pages 1-14
  3. Helge Kragh
    Pages 15-58
  4. Helge Kragh
    Pages 59-112
  5. Helge Kragh
    Pages 113-162
  6. Back Matter
    Pages 163-185

About this book


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.


László Egyed Pascual Jordan Paul Dirac Robert Dicke cosmology expanding Earth general relativity geophysics gravitational constant paleoclimatology plate tectonics

Authors and affiliations

  • Helge Kragh
    • 1
  1. 1.Niels Bohr ArchiveNiels Bohr InstituteCopenhagenDenmark

Bibliographic information