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:

Answer:

(A) Reginald Aldworth Daly in 1946. Velikovsky got a lot of attention, but never published in a scientific journal. Shoemaker was mostly interested in the meteoritic origin of craters. Hartmann was the first to persuade a large number of his fellow scientists that the giant impact theory was correct, but the little-known paper by Daly was the first mention of the idea.

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