e designation ‘planets’. The word ‘planet’ originally described ‘wanderers’ that were known only as moving lights in the sky. Recent discoveries lead us to create a new defi nition, which we can make using currently available scientific information.
Resolution 5A
The IAU therefore resolves that planets and other bodies in our Solar System be defi ned into three distinct categories in the following way:
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时间：2009-4-21 17:32:30
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