Abstract
This paper offers a theoretical interpretation of two apparently unrelated numerical coincidences. (1) The observed range of specific gravitational binding energies in astronomical systems includes the range of specific cohesive energies of solids. For example, the planetary system has about the same binding energy per unit mass as a molecular solid. (2) The present age of the universe, measured in units e 2 /m e c 3 , is roughly equal to the ratio between the electrostatic and gravitational interactions between a proton and an electron. Both coincidences are explained by a cosmological theory based on Einstein's theory of gravitation, the cosmological principle (statistical uniformity and isotropy), and the assumption that the universe began to expand from a maximally dense initial state at zero temperature
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