If you're going to be combining nearby objects (such as a spaceship) and 
astronomical objects (such as Sedna) in the same scene, you may need to 
break the scaling.

You can split the scene into things that are nearby and things that are 
far away. Then you can use the fact that an object of diameter 1800km at 
a distance of 145900000000km looks almost exactly the same as an object 
of diameter 1.8m at a distance of 145900km. So dividing the distances 
and sizes of all the far away objects by a million makes no difference 
to the render.

-- 
Mike Williams
Gentleman of Leisure

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