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I can't belive no one has said this yet, but "that's no moon that's a space station".
 
I'm curious as to how exactly you would be able to ascertain that their speed is "correct", seeing as that varies from planet to planet. The only ones we really know are those in our solar system. Not to mention that they are randomly generated anyway.

I didn't mean correct correct. I meant that they do spin with speed proportional to the gamespeed, i.e. when game is paused they don't. And when you play on speed 2, they spin twice as fast as they would on speed 1.

And you know that making them randomly generated actually makes whole "planet moving" thing easier?