History of an outer space exploration . ... The first space rockets . ... In space where there is no air, the engine which is not using air, i.e. the rocket installation is necessary for a flight vehicle. ... The Tsiolkovsky has understood, that firm kinds of fuel are not suit for space flights and has offered to use rocket engines on liquid fuel. ... Tsiolkovsky made a great contribution to the theory of rocket flight. ... From a satellite of the Earth before lunar landing . ...