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Keywords: Cosmotheoros.jpg en During the last years of his life Christiaan Huygens worked on a philosophical treatise addressed to his brother Constantijn which contained his speculations on the construction of the universe and the habitability of the planets as deduced from his own observations and those of other astronomers http //www phys uu nl/~huygens/cosmotheoros_en htm creator Christiaan Huygens 1698 posthumously published PD-old-100 Christiaan Huygens |