> The density of hydrogen atom in outer space is variable, but the
> pressure is in the nano-pascal ( 10^-9 ) range, and we live in
> kilohecto-pascal ( 10^5 ), so the influence of the drag is to be
> corrected by at least something like a 10^-14 factor.

Drag depends on velocity squared, so that would mean if your velocity 
was 10^7 times higher than on earth, you would experience a similar 
level of drag.

I have no idea what "interstellar velocities are" though, 10^7 or more? :-)

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