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A group of letters from multiple researchers from the University of Newcastle, U.S. Naval Observatory, and the University of Louvain. Also included are some of Dirac's responses to these letters. All letters are in regard to Dirac's paper involving the Hubble Constant, which is the unit of measurement used to describe the expansion of the universe and therefore the size and age of it. Dirac's hypothesis of large numbers led to the discovery of an equation that allows for the accurate calculation of the Hubble Constant based on the universal gravitational constant G.
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