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shminux comments on To reduce astronomical waste: take your time, then go very fast - Less Wrong
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Well to be more precise, I took the comoving stress energy tensor of photon gas, rho*diag(1,1/3,1/3,1/3) in the natural units, and Lorentz transformed it. Same for dust, only its comoving stress energy tensor is rho*diag(1,0,0,0).
Okay, so you weren't basing the braking pressure of the gas off of the atmospheric pressure of the gas, but simply off of its density?
I guess I shouldn't be too shocked that super-high vacuum is approximately frictionless.