The Exploration of SpaceTemple Press, 1951 - 198 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 neighbours 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 neighbours 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 they ...
... 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 they ...
Cuprins
THE SHAPING OF THE DREAM | 1 |
Automatic Rocket Surveying Mars | 4 |
THE EARTH AND ITS NEIGHBOURS | 9 |
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acceleration already astronautics astronomers atmosphere atomic rockets body bricks British Astronomical Association 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 gravitational field gravity heat Hermann Oberth hundred miles idea imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing light light-years lunar Mars and Venus Martian means Mercury meteors 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 trolley Uranus voyage weight