The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 88
... light waves might be more convenient than radio . A beam of light can easily be modulated by speech , and , in the heliograph , it was used for sending Morse long before radio was invented . By employing large searchlights as ...
... light waves might be more convenient than radio . A beam of light can easily be modulated by speech , and , in the heliograph , it was used for sending Morse long before radio was invented . By employing large searchlights as ...
Pagina 164
... light- years of the Sun. ( This unit , the distance light travels in a year , is a convenient one for measuring stellar distances . It equals 5,880,000,000,000 miles . ) Only one of our nearest eight neigh- bours is visible , without a ...
... light- years of the Sun. ( This unit , the distance light travels in a year , is a convenient one for measuring stellar distances . It equals 5,880,000,000,000 miles . ) Only one of our nearest eight neigh- bours is visible , without a ...
Pagina 177
... light years . If the ship could achieve 99.999,999,999 , - 999,999,996 per cent . of the velocity of light , the crew would imagine that the journey lasted thirty - three years — yet 10,000 , - 000,000 years would have elapsed before ...
... light years . If the ship could achieve 99.999,999,999 , - 999,999,996 per cent . of the velocity of light , the crew would imagine that the journey lasted thirty - three years — yet 10,000 , - 000,000 years would have elapsed before ...
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