The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 71
... minutes , it is completely changing its direction of motion every three - quarters of an hour . If it is travelling westwards at its orbital speed of 18,000 m.p.h. at one moment , it is moving east- wards at the same speed forty - five ...
... minutes , it is completely changing its direction of motion every three - quarters of an hour . If it is travelling westwards at its orbital speed of 18,000 m.p.h. at one moment , it is moving east- wards at the same speed forty - five ...
Pagina 75
... minutes , during which time the ship would cover a distance of a hundred and sixty miles . It would certainly seem dangerous - not to mention hard on the nerves of the crew ! -to wait until the Moon was so close before doing any braking ...
... minutes , during which time the ship would cover a distance of a hundred and sixty miles . It would certainly seem dangerous - not to mention hard on the nerves of the crew ! -to wait until the Moon was so close before doing any braking ...
Pagina 96
... minutes even in the sitting position . Lying down , the tolerance to acceleration is very greatly increased and a man can survive even twenty gravities for periods of up to a minute . The human body is built , therefore , to far more ...
... minutes even in the sitting position . Lying down , the tolerance to acceleration is very greatly increased and a man can survive even twenty gravities for periods of up to a minute . The human body is built , therefore , to far more ...
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