The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 22
... once that doubling the speed of ejection of the bricks would double the speed of the trolley . But suppose that it was impossible to increase this any further , as would be the case if the brick - thrower were working at the limit of ...
... once that doubling the speed of ejection of the bricks would double the speed of the trolley . But suppose that it was impossible to increase this any further , as would be the case if the brick - thrower were working at the limit of ...
Pagina 50
... once that this effect has nothing at all to do with the reduction of gravity with distance from the Earth . One could , and usually would , feel weightless in a rocket a couple of hundred miles up , where the force of gravity is ...
... once that this effect has nothing at all to do with the reduction of gravity with distance from the Earth . One could , and usually would , feel weightless in a rocket a couple of hundred miles up , where the force of gravity is ...
Pagina 62
... Once again , therefore , we return to the idea of orbital spaceships . Chemical rockets could be used to climb up from Earth and reach orbital velocity , but from there onwards atomic motors would be used . The actual landing on another ...
... Once again , therefore , we return to the idea of orbital spaceships . Chemical rockets could be used to climb up from Earth and reach orbital velocity , but from there onwards atomic motors would be used . The actual landing on another ...
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