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How well do you know the moon? Take our quiz!

Courtesy of NASA/Reuters
Earth rises above the moon's horizon during the Apollo 11 lunar mission in this July 1969 photo.

It has been the subject of popular children's books, the setting for blockbuster sci-fi movies, the center of folklore and legends, and the final frontier in the Cold War space race. Earthly beings have always dreamed about the moon, but it's largely remained a mystery for centuries – until now. Are you a moon master or a lunar loser? Test your moon mastery here.

1. How old is the moon?

8.5 billion years

6 billion years

4.5 billion years

2 billion years

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