ANSWERS: 3
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You just keep your mind on your Uranus. mr Bill
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Assuming a fairly circular orbit, 1989+21 years = 2010.
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Earth's orbit around the sun permits three opportunities to view the rings edge-on: Uranus made its first ring crossing as seen from Earth on May 3 2007, it made its second crossing on Aug. 16 2007, and crossed for the third time on Feb 20, 2008. It won't do so again for 42 more years.
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