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The Null Geodesic-no printing
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The Null Geodesic-no printing

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The ideal example of a "null geodesic" is by definition a "line of sight" light ray, free of any interference from any intervening gravitational fields, especially over unlimited regions of cosmic spacetime.

Hence the "null geodesic" is the mathematical equivalent for a pure Newtonian straight-line in 3-dimensional Euclidean geometric space.

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