[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
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 :)