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Re: Conspiracy Theory- Earth's Expansion

On 2008-01-10 19:19, Thomas R. Holtz, Jr. wrote:

gravity is determined by mass, not diameter.
But surface gravity = Gm/(r^2) (Where G = the gravitational constant).

Since G is a constant, and m would be fixed for the planet, a smaller Earth
would necessarily have a smaller surface gravity.

Larger (_inversely_ proportional to the radius). E.g. if it shrank to 71 percent of its present size, the surface gravity would rise to 2g, and a sufficiently small Earth would collapse into a black hole under its own gravitational pull :)

Piotr Gasiorowski