In Henry Olerich's, "A Cityless and Countryless World" what planet do the aliens come from?
Henry Olerich Henry Olerich (1851–1927) was a utopian author from Nebraska. In his best known novel, "A Cityless and Countryless World" (1893), a Martian lands on earth to teach humans how to create paradise. The method was to build houses that could hold 1,000 people, who would collectively farm and work.
Secondary atmosphere A secondary atmosphere is an atmosphere of a planet that did not form by accretion during the formation of the planet's star. A secondary atmosphere instead forms from internal volcanic activity, or by accumulation of material from comet impacts. It is characteristic of terrestrial planets, which includes the other terrestrial planets in the Solar System: Mercury, Venus, and Mars. Secondary atmospheres are relatively thin compared to primary atmospheres like Jupiter's. Further processing of a secondary atmosphere, for example by the processes of biological life, can produce a tertiary atmosphere, such as that of Earth.