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by Ralph Ellis
Traditional wisdom indicates that the Earth has a liquid/solid iron core (dependent on precise blend of temperature and pressures at the center). However, since gravity is an attraction of mass, at the center of the Earth there will be, by definition, no gravity to pull material inwards. Indeed, the local gravity gradient at the center of the Earth will be towards the center of local mass, which happens to be in any direction as long as it is away from the center of the Earth.
Would not this inverse gravity gradient, combined with a lack of
centrapetal force (or outward centrafugal force), tend to draw material
away from the center of the Earth (as there is nothing at the center to
draw it inwards), resulting in a hollow Earth? The hollow Earth has, of
course, been a favourite topic of fringe science for generations, but is
this not a more stable configuration than a solid core that has no gravity
at the center to maintain this solidity?
Source: New Scientist Magazine, London (Last Word section)
© 2003 R. Ellis
Copyright 2003 by World-Mysteries.com