this post was submitted on 26 Oct 2025
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Science Memes

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[–] tetris11@feddit.uk 7 points 16 hours ago (3 children)

is the speed of causality tied to speed of light in a vacuum, or independent of it?

[–] Ephera@lemmy.ml 21 points 15 hours ago

As I understand, the speed of light in vacuum is bound by the speed of causality. So, light would go at infinite speed, if it could (it being massless means any acceleration should result in infinite speed), but instead it goes as fast as the universe allows, which is the speed of causality.

[–] frezik@lemmy.blahaj.zone 14 points 16 hours ago* (last edited 16 hours ago) (1 children)

Speed of Causality is the absolute maximum speed. It's the theoretical maximum that any cause could propagate an effect. Speed of Light in a (perfect) vacuum happens to be equal to the Speed of Causality.

[–] MojoMcJojo@lemmy.world 2 points 13 hours ago (1 children)

Is the speed of causation propagation linked to plank length?

[–] Natanael@infosec.pub 2 points 12 hours ago

Yes, it's derived from 4 physical constants including c