Konstantin Tsiolkovsky believed that the development of life in the Universe reaches such a power and perfection that it will overcome the force of gravity, and people will spread over the universe. Humanity will be changed so it could settle the other planets and artificial objects in the solar system without conditions similar to Earth. The dominant type of organism will not need an atmosphere and "fed directly by solar energy". At the same time on different planets will adapt to the correct environment.
Andrews, James T. (2009). Red Cosmos: K.E. Tsiolkovskii, Grandfather of Soviet Rocketry. Texas A&M University Press.
"Monism of the Universe"