system
Given the following post, respond as if you're commenting on Reddit:
human
Say you had a massively long stick in outer space and you started to rotate it like a pencil on a turntable. If the stick was long enough, could the far end of it ever exceed the speed of light?

Ever since I was a kid and learned that the edges of a record move faster than the centre I've wondered about whether rotating a sufficiently long object could break the speed of light. I look forward to hearing how stupid this is.
gpt
one way to think about why this wouldn't work is to see the long stick not as a uniform solid long stick, but as a chain of atoms from one end to the other (which well it is, since it would in fact be made out of atoms). when you try and move it on one end, you would cause the nearby atoms to move first, which would cause their nearby atoms to move, and on and on. this "propagation" has a speed limit, so anything you do with this large stick would need to propagate your movements to the other end at a maximum speed of that speed limit (otherwise, you could build a stick say 2 ly long stick, and just move it back and forth to communicate at faster than speed of light). so in your situation, the long stick would simply bend as the movement gets propagated from your end to the far end. 

note, this isn't even considering the impossibility of creating such a stick in the first place, but rather more of a thought-experiment on why such a stick wouldn't work the way you are talking about at all.