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Posted by Bruce on March 15, 2001 20:45:10 UTC

In Einstein's theory of GR gravity is not a force. "Einstein says you can do away with Newton's gravitational force, substituting instead the idea of a geodesic: A free test particle moves along a worldline straight in spacetime as described with respect to every LOCAL free-float frame through which it passes. But the result may be a path curved in spacetime as described by global Schwarzchild coordinates." (Edwin Taylor) Principle of extremal aging: The path that a free particle takes between two events in spacetime is the path for which the time lapse between these events, recorded on its wristwatch, is an extremum. This path is a geodesic; a path which a free test particle takes through spacetime where no forces are acting upon it. The moon's wordline is a geodesic. The Sun's wordline is a geodesic. The Earth's wordline is a geodesic. Etc..

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