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一光年就是9.4607*10^15米.所以4億光年就是3.7843*10^21千米
準確的說,1光年約等於94600億千米,也等於65000天文組織.注意:光年是距離組織.
光速c=299792458km/s.一光年等於94605億千米 ,等於9460500000000米.
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