Said another way - light follows the shortest path between two points. In flat spacetime, that is a line. In curved spacetime, it may be some other path - like

Said another way - light follows the shortest path between two points. In flat spacetime, that is a line. In curved spacetime, it may be some other path - like a path traced by an ant walking on a sphere. These paths are called geodesics: https://en.wikipedia.org/wiki/Geodesics_in_general_relativity https://en.wikipedia.org/wiki/Geodesics_in_general_relativit...