Abstract
Dirac's large-numbers hypothesis and Mach's principle of inertia which both predict that the strength of gravity decreases with time are discussed. Experiments to test this hypothesis such as observations of lunar occultations, lunar laser-ranging measurements and precise radar-ranging measurements are being carried out. Preliminary data indicate that the value of G is decreasing. One implication according to the large-numbers hypothesis is that the number of nucleons in the universe must be increasing at a rate proportional to the passage of time squared. A theory is proposed to account for this phenomena based on the hypothetical existence of a shield against gravity found only in very dense matter. Implications for the theories of special and general relativity are discussed. (BJG)
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