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Unlikely_Concept5107 t1_j59tlj0 wrote

Reply to comment by Anonymous-USA in The critical atom (thought experiment) by ThePropagandaTower

Im no expert but isn’t “gravity” and “warped spacetime” really just the same thing?

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Anonymous-USA t1_j5af6kl wrote

Hard to say since no one actually knows what gravity is! 😆 But the distinction I was making is that a photon has no mass, so light doesn’t actually change directions due to gravity so much as it travels a strait line through a warped space-time.

ie. Gravitational force F=(G × M1 × M2) / D^2

Photon M2 has mass of 0. This suggests it could escape the black hole as there’s no gravitational force between them, but obviously it cannot due to the curvature of space.

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