wrote:

One of them accelerated or space-time expanded inbetween both.
Follow?



Who cares if one or both accelerated in the past, as long as they are
*currently* travelling at constant velocity relative to one another? In
any case, are you really arguing that the one that accelerated in the
past is automatically the one that is "really" moving? Suppose two ships
are travelling at constant velocity relative to absolute space, and then
one ship accelerates until it is at absolute rest (in physics,
'acceleration' means any change in velocity, so it can mean decreasing
velocity as well as increasing velocity). In this case, it is the one
that accelerated that is "really" at rest relative to absolute space,
and the one that did not accelerate is "really" moving.

Jesse