Physics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984em%26p...31...43y&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 31, Aug. 1984, p. 43-47.
Physics
1
Geodesy, Geodynamics, Planetary Evolution, Expansion, Radii
Scientific paper
A study of the displacement of the continents suggests that the earth's radius has increased by almost 20 percent in the past 200 million years. A proposal that the earth's liquid core is a high pressure phase of the mantle material has been adopted to calculate the earth's radius under the variable gravitational constant G. According to the Dirac large-numbers hypothesis, it is shown that if G varies, the primordial earth should have a 700-km smaller radius than the present value. If the earth began to expand only 200 million years ago, an expansion as large as 700 km is shown to be energetically plausible. However, through the use of models under the Dirac hypothesis, it has also been shown that the rate of change of the earth's radius is approximately 200 km. An investigation into the possibility of proposing a model which is in closer agreement with recent results seems desirable. It is noted that an expanding earth should have an effect on its rotation and, hence, on the secular accelerations of the sun and moon.
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