The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 125
... telescope under conditions of good seeing , is in much the position as someone looking at the Moon with the naked eye — or , at the best , with a pair of weak opera - glasses . Though we have telescopes that could bring Mars to within a ...
... telescope under conditions of good seeing , is in much the position as someone looking at the Moon with the naked eye — or , at the best , with a pair of weak opera - glasses . Though we have telescopes that could bring Mars to within a ...
Pagina 153
... telescope structure need have only enough strength to maintain its stiffness . Indeed , the optical elements might ... telescope yet built is over 200 feet in diameter ( compared with 200 inches for the largest optical telescope ) but ...
... telescope structure need have only enough strength to maintain its stiffness . Indeed , the optical elements might ... telescope yet built is over 200 feet in diameter ( compared with 200 inches for the largest optical telescope ) but ...
Pagina 164
... telescope some of the great star clusters look like collections of jewels glittering against the blackness of space . There are eight stars ( two of them double ) within ten light- years of the Sun. ( This unit , the distance light ...
... telescope some of the great star clusters look like collections of jewels glittering against the blackness of space . There are eight stars ( two of them double ) within ten light- years of the Sun. ( This unit , the distance light ...
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