This paper discusses the hypothesis of the expanding Earth in the period ca. 1950-1975 and how it interacted with Paul Dirac’s cosmological hypothesis of a decreasing gravitational constant. It pays particular attention to the models in which the expansion of the Earth was thought to be caused by a varying gravitational constant. These models, primarily due to Pascual Jordan, László Egyed and Robert Dicke, were for a decade or so considered interesting alternatives to continental drift.