In the superman Nietzsche showed the world a conceivable and possible goal for all human effort. But there still remained a problem and it was this: When the superman at last appears on earth, what then? Will there be another super-superman to follow and a super-supersuperman after that? In the end, will man become the equal of the creator of the universe, whoever or whatever He may be? Or will a period of decline come after, with a return down the long line, through the superman to man again, and then on to the anthropoid ape, to the lower mammals, to the asexual cell, and, finally, to mere inert matter, gas, ether and empty space?
Nietzsche answered these questions by offering the theory that the universe moves in regular cycles and that all which is now happening on earth, and in all the stars, to the uttermost, will be repeated, again and again, throughout eternity. In other words, he dreamed of a cosmic year, corresponding, in some fashion, to the terrestrial year. Man, who has sprung from the elements, will rise into superman, and perhaps infinitely beyond, and then, in the end, by catastrophe or slow decline, he will be resolved into the primary elements again, and the whole process will begin anew.