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AndromedaRXJ said:I know I asked this already, but so this isn't equivalent to what a tachyon would do? Or rather, suppose a tachyon went the exact same speed as the dot. Would the observation of its motion be the same?
There is no mystery about a tachyon if you consider a single reference frame. It's simple kinematics. Speed is distance/time.
The problem comes when you consider the motion in another reference frame, using the Lorentz transformation. Then you have, for example, the Tachyon moving in the opposite direction in that reference frame. And, if you use tachyons to transmit messages you can create causality problems, by getting a response to a message before you have sent it.