 through terraforming.Venus was never quite so popular as Mars, probably because it obdurately refused to display any surface features (it is covered with sulfuric acid clouds only dimly translucent to visible light), making any statement about its nature disturbingly speculative.In 1918, chemist Svante Arrhenius, deciding that Venus' cloud cover was necessarily water, decreed in "The Destinies of the Stars" that "A very great part of the surface of Venus is no doubt covered with swamps" and compared Venus' humidity to the tropical rain forests of the Congo.