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In my lifetime there has been tremendous evolution in man’s ideas about the moon’s origin. In the 1960s, planetary scientists were convinced that the moon formed one of three ways . . .
But by the 1970s, it was clear, both from physical problems with each theory and from lunar composition measured from samples Apollo astronauts brought to earth, that none of the three theories were correct. Hence, by the late 1970s, planetary scientists developed a hybrid model of the moon’s origin, a scenario that hopefully kept the advantages of each of the three basic theories, while avoiding the shortcomings of each . . .
While this remained the standard theory for more than three decades, apparently there still were problems with the moon’s composition that this model did not explain well.To read the article in it's entirety, click on "A New Theory for the Moon’s Origin".