The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 65
... produce small thrusts for long periods of time than very great thrusts for short periods . We have to use the latter to get our spaceships away from the Earth , and thus we may be forced to employ chemical rockets at this stage . But ...
... produce small thrusts for long periods of time than very great thrusts for short periods . We have to use the latter to get our spaceships away from the Earth , and thus we may be forced to employ chemical rockets at this stage . But ...
Pagina 75
... produce changes of spin and orientation , though very small ones . If it proved necessary , these could be taken care of by automatic , gyro - controlled equipment . To return to our ship falling towards the Moon . We will assume that ...
... produce changes of spin and orientation , though very small ones . If it proved necessary , these could be taken care of by automatic , gyro - controlled equipment . To return to our ship falling towards the Moon . We will assume that ...
Pagina 179
... produce one of the " space drives " so beloved of science - fiction writers . These drives , for the benefit of anyone unacquainted with contemporary mythology , have the great advantage that , since the force they produce acts ...
... produce one of the " space drives " so beloved of science - fiction writers . These drives , for the benefit of anyone unacquainted with contemporary mythology , have the great advantage that , since the force they produce acts ...
Cuprins
The Shaping of the Dream | 1 |
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
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Termeni și expresii frecvente
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