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 |
THE EARTH AND ITS NEIGHBOURS | 9 |
THE ROCKET | 17 |
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able acceleration actual already appear astronautics astronomers atmosphere atomic become body build carry certainly Chapter close completely consider considerable course deal developed difficult direction discovered discuss distance Earth effect energy escape exist exploration extremely fact fall field Figure fuel give given gravity greater heat human hundred idea imagine important impossible increase interesting interplanetary involved journey known landing least less light limit live look lunar Mars material matter means miles minutes Moon motors necessary never observed once orbit oxygen perhaps period planets Plate possible practical present pressure probably problem produce purely radio reach reason relatively remain rocket round satellite scientific seems seen ship shown simple Solar space spaceship speed stars stations structure surface telescope temperature thousand Universe velocity Venus weight whole