Thanks to everyone who replied on this thread.

I note the point that the problem of moving faster than light cannot be
ignored. In a discussion I'd been having, it was claimed that the stars
are so far apart that if you moved from one star to another you
wouldn't see stars whizzing past you at high speed like you do in
Celestia and in many science fiction movies and television programs.
However arguing that one viewpoint that breaks the laws of physics is
somehow "correct" and another viewpoing that breaks the laws of physics
is "incorrect" doesn't really make sense.

Cheers,

Ross-c