In the Days of the Comet by H. G. Wells

According to Wikipedia, In the Days of the Comet is a 1906 science fiction novel by H. G. Wells in which the vapors of a comet are used as a device which brings about a profound and lasting transformation in the attitudes and perspectives of humankind. Herbert George Wells (21 September 1866 – 13 August 1946) was an English author, now best known for his work in the science fiction genre. He was also a prolific writer in many other genres, including contemporary novels, history, politics and social commentary. Together with Jules Verne, Wells has been referred to as The Father of Science Fiction.