Limits to the expansion of Earth, Moon, Mars and Mercury and to changes in the gravitational constant

  title={Limits to the expansion of Earth, Moon, Mars and Mercury and to changes in the gravitational constant},
  author={Michael W. McElhinny and S. Ross Taylor and David J. Stevenson},
New estimates of the palaeoradius of the Earth for the past 400 Myr from palaeomagnetic data limit possible expansion to less than 0.8%, sufficient to exclude any current theory of Earth expansion. The lunar surface has remained static for 4,000 Myr with possible expansion limited to 0.06%, the martian surface suggests a small possible expansion of 0.6% while the surface of Mercury supports a small contraction. Observations of Mercury, together with reasonable assumptions about its internal… 
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