How well do you know the Moon? Take this twenty-question quiz and see! Don't worry, there are no grades on this quiz. Most of the answers can also be found in my book, The Big Splat.

8. What is the current best estimate of the Moon's age, according to planetary scientists?

(A) 6000 years

(B) 200 million years

(C) 1 billion years

(D) 4.5 billion years

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