this post was submitted on 11 Feb 2025
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It can look dumb, but I always had this question as a kid, what physical principles would prevent this?

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[โ€“] [email protected] 11 points 1 day ago (3 children)

A perfectly rigid object would be usable as a tool of FTL communication

Would it though? I feel like the theoretical limit is still c

[โ€“] [email protected] 18 points 1 day ago

Yes, that's the point. The limit c denies the possibility of a perfectly rigid body existing physically. It can only exist as a thought experiment.

[โ€“] whyNotSquirrel 11 points 1 day ago (1 children)

What about using c++ or rust?

[โ€“] [email protected] 3 points 19 hours ago

That'll anger the universe's devs who will then bully you.

[โ€“] [email protected] 5 points 1 day ago

Yes, the speed of sound in an object is how fast neighboring atoms can react to each other, and not only is that information (therefore limited to C already) but specifically it's the electric field caused by the electrons that keep atoms certain distances from each other and push each other around. And changes in the electric/magnetic fields are famously carried by photons (light) specifically - so even in bulk those changes move at the speed of light at most