Obviously theoretical but if I took a light year long stick and say pushed a button at the other end would that button be pushed at the same time for me as say someone standing at the button? How does the frame of reference work when physically moving something? And could that “work” as a method of instant communication?
In: Planetary Science
The push travels along the stick at the speed of sound in that material.
For a 1 light year long stick made of steel it would take 50,000 years for your push to get to the button at the other end.
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