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Question

Gravity Affects Light, But Why?


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Solution

Gravity affects light:

  1. Massive things, according to Einstein's theory of relativity, bend the spacetime around them.
  2. Light appears to be twisted when it travels through the warped spacetime of a big object because photons travel the shortest route between two places.
  3. This means that gravity does not directly bend light by influencing photon motion; rather, the spacetime around a massive object (a black hole) is twisted, and light follows the shortest path (which is slightly curved), giving the impression that the black hole is influencing light motion.

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