If you search the forums, you will likely find that this is due to trying to
model the scene in "realistic units".
(Lookup "Ringworld", for instance)
Also, this ought to still be in the FAQ.

Numbers in a computer can only be so large, and so the numbers themselves "get
clipped" and suffer from floating point accuracy issues.

Scale everything down so that your number are less than maybe 1E9 or so, and I'm
sure that you'll see an improvement.

Welcome.

- BE

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