The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 35
... escape velocity as quickly as possible — and then to cut the rockets and " coast . " A commonplace but accurate analogy is given by the cyclist who builds up enough speed on the level to take him over a hill . To surmount our imaginary ...
... escape velocity as quickly as possible — and then to cut the rockets and " coast . " A commonplace but accurate analogy is given by the cyclist who builds up enough speed on the level to take him over a hill . To surmount our imaginary ...
Pagina 92
... escape velocity : at five gravities , only three and a half . Men can stand considerably higher accelerations for longer periods than this if they are suitably protected . But , in fact , the requirements of astronautics are nothing ...
... escape velocity : at five gravities , only three and a half . Men can stand considerably higher accelerations for longer periods than this if they are suitably protected . But , in fact , the requirements of astronautics are nothing ...
Pagina 93
... escape velocity in as leisurely a fashion as one pleased . This is clearly not practicable , but some- thing not far from it would be achieved if the spaceship rose ver- tically for the first fifty miles and then veered eastwards , as ...
... escape velocity in as leisurely a fashion as one pleased . This is clearly not practicable , but some- thing not far from it would be achieved if the spaceship rose ver- tically for the first fifty miles and then veered eastwards , as ...
Cuprins
The Shaping of the Dream | 1 |
Navigation and Communication in Space | 78 |
1 | 118 |
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acceleration airless asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical completely course crew diameter difficult distance Earth energy engineering enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy gases gravitational field gravity heat hundred hydrogen imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing LEWIS CARROLL light light-years lunar Mars and Venus Martian means Mercury meteors miles million minutes missiles Moon Moon's motors never normal observed orbit oxygen payload perhaps planetary Plate Pluto possible pounds pressure probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refueling rocket power satellite Saturn scientific ship Solar System space space-flight space-stations space-suits space-travel spaceship speed spinning stars stations structure sunlight surface take-off tanks telescope temperature thousand thrust trolley Uranus vehicle voyage weight weightless