20. Which of the following theories is the current consensus among lunar scientists about the Moon's origin?

Answer:

(D) The Moon coalesced out of the debris of a giant collision between Earth and another planet (giant impact theory). The other three theories all had some advocates before (and even after) the Apollo missions, but they have been discarded by nearly all planetary scientists.

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If you answered all the questions, then you passed – because you showed that you care about the Moon!

If you got all 20 right, then you should have written the book, not me! If you got 0 to 19 right, go to www.wiley.com or www.amazon.com right now and buy my book, The Big Splat, or How Our Moon Came to Be. Thanks for taking the quiz!

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Last modified: May 5, 2003