> Interesting. So the effects of relativity are based on speed (relative
> to a frame of reference), not gravitational force?
>
(Sorry did not answer this on previous post) Yes. Special relativity which
is used to most of this does not involve gravity at all except as a force
like any other. In my entire special relativity course and books gravity
never comes up that would be a much later course .
From the foundation of this Einstein went on to postulate general
relativity which ties gravity into the whole thing . For any purpose in
traveller where you do not have a neutron star or similar Special realtivity
should suffice , for most purposes Newtonian mechanics work fine