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September 21, 2014

September 21, 2014

Posted by **sally** on Friday, November 26, 2010 at 4:14pm.

-thank you in advance

- science-math -
**Damon**, Friday, November 26, 2010 at 4:56pmassume you mean 12,000 km wide

4*10^4 * 1.2 * 10*4 = 4.8*10^8

= 480,000,000 km^2

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