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Re: Simple Question

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Posted by Herb S. on February 24, 2000 00:46:56 UTC

: If light has no mass, why can't it escape the gravitational pull of a black hole, seeing as an object requires mass to be "pulled" on?

Liight has no REST mass. It does have energy (and therefore equivalent mass) and is thus subject to gravity. This was one of the factors in the famous 1919 eclipse observation (bending of starlight past the sun) which gave credence to General Relativity.

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