Orchid XP v8 wrote:
> Or if we were radically larger/smaller, the concept of a "fixed point in
> space" would seem incongruous.
> 
> (On a large scale, planets, stars and galaxies wander round all over the
> place Similarly on a sufficiently small scale.)

That's a problem for time traveling. You have to travel in time yet stay in
the same point in space. Oh wait, that would leave you in the middle of
nowhere without an atmosphere. You have to stay in the same point in space
*relative to your planet*!

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