Closest celestial object that has bound synchronous rotation

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Guarana
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Homework Statement


What is the closest celestial object that has bound synchronous rotation with another object?

Homework Equations


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The Attempt at a Solution


I am almost sure it's Moon.
 

Discussion

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Guarana said:

Homework Statement


What is the closest celestial object that has bound synchronous rotation with another object?

Homework Equations


-

The Attempt at a Solution


I am almost sure it's Moon.
How might you confirm your guess?
 

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