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 an ant walking on a piece of paper and always moving straight ahead.
If we leave the paper flat it will trace a straight line.
Now bend the paper. The ant still moves straight ahead but “straight ahead” is a different direction then when the paper was lying flat and so it traces a different trajectory. The geometry of what the ant is moving on (or more precisely *within*) influences how the ant moves on it (through it).
Gravity is analogous in the sense that it’s not a force pulling the light in a different direction but a change in the geometry of what light is moving through.
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