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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Imagine a piece of paper and draw a horizontal line on it.
Now shape that paper into a cylinder but vertically.
The line itself is still straight but the way you see the line is not straight anymore.
Welcome to the world of spacetime curvature 🙂
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