The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 46
... greater than that needed merely to escape - though in most cases only slightly greater . ( 2 ) When it approaches the planet of destination , it must use rocket power again to match the speed of the planet , and to lower itself safely ...
... greater than that needed merely to escape - though in most cases only slightly greater . ( 2 ) When it approaches the planet of destination , it must use rocket power again to match the speed of the planet , and to lower itself safely ...
Pagina 97
... greater than that of our own world and possessing stable surfaces on which we should ever wish - or be able - to land . So much for the danger of excessive weight . But what of the other extreme - no weight at all ? Here we are ...
... greater than that of our own world and possessing stable surfaces on which we should ever wish - or be able - to land . So much for the danger of excessive weight . But what of the other extreme - no weight at all ? Here we are ...
Pagina 180
... greater and greater volume of space will become accessible to exploration . Before closing this chapter we must deal with two questions which any discussion of interstellar travel inevitably raises . In the first place , despite the ...
... greater and greater volume of space will become accessible to exploration . Before closing this chapter we must deal with two questions which any discussion of interstellar travel inevitably raises . In the first place , despite the ...
Cuprins
The Shaping of the Dream | 1 |
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
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acceleration already asteroids astronautics astronomers atmosphere body bricks 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 giant gravitational field gravity heat Hermann Oberth hundred miles idea imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing light light-years lunar Mare Imbrium Mars and Venus Martian means Mercury meteors million 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 tion trolley Uranus voyage weight