Abstract
IT can be proved1 (if the gravity coefficient G varies with time2) that once, many millions of years ago, the Moon had a metallic central core, the radius of which decreased as the time elapsed. This hypothesis is based on Prof. L. Egyed's theory of the expansion of the Earth3.
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References
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HÉDERVÁRI, P. Instability of Small-size Planetary Cores and the Development of the Moon. Nature 202, 378–380 (1964). https://doi.org/10.1038/202378a0
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DOI: https://doi.org/10.1038/202378a0
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