In the case of black holes, lights are pulled into by great gravitational force exerted by the dying stars (which forms into a black hole). If light has no mass, how is light affected by gravity?
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Light has no REST mass. It has mass. The theory of relativity says everything’s mass increases exponentially as it approaches the speed of light; a light photon with 0 rest mass, which travels at the speed of light, therefore has a mass of 0 * infinity, which works out to a finite number (the universe’s doing, not mine). And that finite mass is subject to gravity, just like any mass.
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