Even though Venus isn't the closest planet to the sun, it is still the hottest. It has a thick atmosphere full of the greenhouse gas carbon dioxide and clouds made of sulfuric acid. Rejsen til Messias by Ebbe Kløvedal Reich, 1974, Gyldendal edition, in Danish.
His own first solo-written novel was Rejsen til Venus, published in 1915. Before becoming a professional fiction-writer, Meyn worked for a while for the East Asiatic Company, and... Niels Meyn: Seikkailuja maailman avaruudessa.