Buffy:
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Its called accelleration! Confusingly for the layman, accelleration is stated as "distance per seconds squared." Using calculus, the equation for accelleration is the integral of the equation for velocity, and conversly the differential of in the opposite direction. You can have accelleration of accelleration too! Calculus and differential equations handle this stuff quite well! A little education can take you a long way!
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Come on Buffy, don't do that. I'm fairly good at math. Stop with the insults. The problem I was trying to point out here is that we need to come up with an explanation of how expansion results in an underneath change in velocity. I don't have a problem with a car maintaining a velocity but I do with a spacecraft not under thrust. In other words, what's the physical explanation for the change in velocity that has to occur because 19 minutes from now it's covering 'twice' the space in the same amount of time. There's something fundamental to the theory in this scenario.
In the case of the car, everything in the car is getting bigger and its momentum will continue to apply its now larger wheels, etc. and its speed will remain the same. But the spacecraft is different. I have a blindspot here and need to get past it.
