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**1. The problem statement, all variables and given/known data**

Sputnik I, the first artificial satellite to circle the planet (October 1957) had a mean orbital radius of 6953 km. Compute its period

**2. Relevant equations**

How do I compute the period?

**3. The attempt at a solution**

I thought that the radii of the sputnik could be compared to that of the moon, and same tih the period.