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...
If I choose my car to be my RF, and notice that the highway, trees
etc are going past me at a reasonable constant speed of 20 m/s and I
suddenly mash down on the middle pedal of my car.
I notice that the stuff piled on the back seat of my car 'rushes
forward' onto the floor, (presumably, somehow pulled forward by the
outside world) but the things outside my car seem to be indifferent
to my having stopped the world from moving.
...
(I ALSO have to wonder how my little Saturn is able give the highway
such a tremendous amount of KE and have the brakes absorb it - but
Leigh would just say that I am reifying energy and should stop DOING
that!! :-)
In any event, what this exercise shows if that *if* we could invent a^^^
rocket propulsion technology that would allow accelerations comparable
to 1 g for a few tens of years, then there is no place in the currently
observable universe which would not be unaccessible to human visitation
over the lifespan of a single human being ....