The Escape of Light from within a Massive Object

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Abstract
An analysis is made of the escape of light from within spherically symmetric gravitational masses. It is found that there exist models where a portion of the light emitted inside a star does not escape past the surface; rather, only light within a certain, variable ‘ escape cone ’ leaves the star. This ‘ escape cone ’ does not steadily shrink with decreasing radius of emission, unlike the somewhat analogous cone effect for light in an external spherically symmetric field.

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