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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Things that effect mass also effect energy.
A more accurate form of mass / acceleration calculations should include energy but it makes a very very small difference.
I can’t find it now but I did see somewhere the formula F = mA re-written to include energy by including part of the E=mc^2 formula.
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