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Here is the experience:

A photon P travels from X to Y through tube drilled inside the earth from the North Pole to the South Pole. A photon Q travels from A to B, which is the exact same segment translated outside the gravity pull of the earth.

Would the photon P take more time to reach its destination than the photon Q? Said otherwise, does the curvature of space generated by the earth's gravity makes the distance longer?

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