Once the Aristotelian concept of an eternally stable universe had been shattered, the idea of collision between heavenly bodies soon gained credance. This is reviewed here in all its aspects. The main emphasis is on meteorites and their effects on the surface of the Earth and the Moon, the craters produced, and the decreasing frequency of collisions with the increasing age of the solar system. Tektites are discussed in some detail, and crater produced experimentally in the author laboratory are mentioned.
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