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Light-Speed Spaceships Would Have Trouble Phoning Home
(www.iflscience.com)
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this post was submitted on 11 Dec 2023
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C is more than just the speed of light. It is the speed of Causality. No information can travel faster than C in a vacuum. Gravitational waves already reach us faster than the light from events that cause them (i.e. neutron star collisions) Because small particles slow down the light over long distances, as they absorb and then re-emit the photons.