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.

19. The first known paper in a scientific journal to suggest that the Earth had suffered a cosmic run-in with another planet was by:

(A) Reginald Aldworth Daly in 1946.

(B) Immanuel Velikovsky in 1950.

(C) Eugene Shoemaker in 1960.

(D) William Hartmann in 1974.

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