The Exploration of SpaceHarper, 1951 - 199 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 | 7 |
The Rocket | 17 |
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Termeni și expresii frecvente
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