Yep, you're right  4 centrifuges . . . I just checked up on that aerial photograph that popped up on the 'net a while ago.
http://missionspace.wdwmagic.com/
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--Madison--
...down at the Ozdust!
Like a grand and miraculous spaceship, our planet has sailed through the universe of time. And for a brief moment, we have been among its many passengers.
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