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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According to general relativity, gravity is the result of mass causing a curvature of space-time.
Photons always travel in what they think is a straight line. The thing is, if you travel a locally straight line in a curved space, your path ends up curving over a long distance. It’s kind of like how if you walk in a straight line on Earth you’ll eventually end up back where you started.
Photons are basically the universe’s flat earthers
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