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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Gravity bends “spacetime”
This means that the light is following a straight path through curved space.
When we are outside of that “curved space” the apparent bending of light lets us know that the space it travelled through is curved.
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