The Exploration of SpaceTemple Press, 1951 - 198 pagini |
Din interiorul cărții
Rezultatele 1 - 3 din 20
Pagina 44
... relatively gentle , and so little energy is needed to move along it . In most cases , in fact , much more energy is re- quired in the escape from a planet's own gravitational field - something which has to be done in the first thousand ...
... relatively gentle , and so little energy is needed to move along it . In most cases , in fact , much more energy is re- quired in the escape from a planet's own gravitational field - something which has to be done in the first thousand ...
Pagina 76
... relatively flat areas which would provide suitable places for a touch - down . Helicopter undercarriages have been made which are able to absorb rates of descent of forty feet a second , and this would correspond to a free fall on the ...
... relatively flat areas which would provide suitable places for a touch - down . Helicopter undercarriages have been made which are able to absorb rates of descent of forty feet a second , and this would correspond to a free fall on the ...
Pagina 170
... relatively close suns of our local system . We are looking past them , and across the immensity of intergalactic space , as a town - dweller might look past the street - lamps of his suburb to the lights of another city , many miles ...
... relatively close suns of our local system . We are looking past them , and across the immensity of intergalactic space , as a town - dweller might look past the street - lamps of his suburb to the lights of another city , many miles ...
Cuprins
THE SHAPING OF THE DREAM | 1 |
Automatic Rocket Surveying Mars | 4 |
THE EARTH AND ITS NEIGHBOURS | 9 |
Drept de autor | |
22 alte secțiuni nu sunt arătate
Alte ediții - Afișează-le pe toate
Termeni și expresii frecvente
acceleration already astronautics astronomers atmosphere atomic rockets body bricks British Astronomical Association build carry certainly Chapter chemical completely course crew degrees F difficult direction distance Earth energy enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy gravitational field gravity heat Hermann Oberth hundred miles idea imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing light light-years lunar Mars and Venus Martian means Mercury meteors minutes missile Moon Moon's motors never observed oxygen payload perhaps planetary planets Pluto possible pounds pressure pressurised probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refuelling return to Earth rocket power satellite Saturn scientific ship Solar System space space-flight space-station space-suits space-travel spaceship speed spinning stars stations surface take-off telescope temperature terrestrial thousand thrust trolley Uranus voyage weight