The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 72
... acceleration of one gravity . After just over five min- utes , it would have built up speed from 18,000 m.p.h. to the 24,900 m.p.h. needed to get it to the Moon . During the closing stages the motors would probably be throttled back to ...
... acceleration of one gravity . After just over five min- utes , it would have built up speed from 18,000 m.p.h. to the 24,900 m.p.h. needed to get it to the Moon . During the closing stages the motors would probably be throttled back to ...
Pagina 94
... acceleration . This is yet another of the difficulties of space - flight which in the past has been grossly exaggerated . At an acceleration of two gravities , it would take nine minutes to reach escape velocity : at five gravities ...
... acceleration . This is yet another of the difficulties of space - flight which in the past has been grossly exaggerated . At an acceleration of two gravities , it would take nine minutes to reach escape velocity : at five gravities ...
Pagina 96
... acceleration— perhaps as much as three gravities — be required . This would last just over a minute . For the rest of the powered trajectory , from B onwards , the acceleration need be little more than one gravity and the crew would ...
... acceleration— perhaps as much as three gravities — be required . This would last just over a minute . For the rest of the powered trajectory , from B onwards , the acceleration need be little more than one gravity and the crew would ...
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