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.

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

(A) The Moon was ripped loose by the Earth's rapid rotation or by solar tides (fission theory)

(B) The Moon was a stray planet captured by the Earth's gravity (capture theory)

(C) The Moon formed at the same time and in the same location as Earth (co-accretion theory)

(D) The Moon coalesced out of the debris of a giant collision between Earth and another planet (giant impact theory)

Click here to see the answer.