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The last years of Huygens, who never married, were characterized by loneliness and depression. As a rationalist, he refused to believe in an immanent supreme being, and could not accept the Christian faith of his upbringing. Although Huygens did not believe in such a supernatural being, he did hypothesize on the possibility of extraterrestrial life in his "Cosmotheoros", which was published shortly before his death in 1695. He speculated that extraterrestrial life was possible on planets similar to Earth and wrote that the availability of water in liquid form was a necessity for life.
never married