Two key points discussed in his works are liquid fuels and staging .
1903 - Konstantin Tsiolkovsky begins a series of papers discussing the use of rocketry to reach outer space , space suits , and colonization of the solar system .
Two key points discussed in Konstantin Tsiolkovsky 's works are liquid fuels and staging .
1903 - Konstantin Tsiolkovsky begins a series of papers discussing the use of rocketry to reach outer space , space suits , and colonization of the solar system .