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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as many have already pointed out that light is indeed traveling straight-it’s just space that’s bent.
a neat analogy i was once told goes as follows.
imagine riding a bike and steer straight ahead. you will travel straight.
now the same scenario but you start leaning to the left. you are still steering straight ahead but bc you are leaning to the left the straight line turns into a left curve! (light = bike; leaning to the left = influence of bent spacetime)
hope that helps:)
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