The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 160
... 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 neighbors 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 neighbors is visible , without a ...
Pagina 171
... light had been approached . As is now well known , at velocities approaching that of light some very peculiar things begin to happen . These were pointed out by Einstein when he formulated the Special Theory of Relativity , and they ...
... light had been approached . As is now well known , at velocities approaching that of light some very peculiar things begin to happen . These were pointed out by Einstein when he formulated the Special Theory of Relativity , and they ...
Pagina 172
... light . Sup- pose it left Earth at an acceleration of two gravities and main- tained this until it had reached its ... light years . If the ship could achieve 99.999,999,999,999,999 996 per cent of the velocity of light , the crew would ...
... light . Sup- pose it left Earth at an acceleration of two gravities and main- tained this until it had reached its ... light years . If the ship could achieve 99.999,999,999,999,999 996 per cent of the velocity of light , the crew would ...
Cuprins
The Shaping of the Dream | 1 |
Navigation and Communication in Space | 78 |
1 | 118 |
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acceleration airless asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical completely course crew diameter difficult distance Earth energy engineering enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy gases gravitational field gravity heat hundred hydrogen imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing LEWIS CARROLL light light-years lunar Mars and Venus Martian means Mercury meteors miles million minutes missiles Moon Moon's motors never normal observed orbit oxygen payload perhaps planetary Plate Pluto possible pounds pressure probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refueling rocket power satellite Saturn scientific ship Solar System space space-flight space-stations space-suits space-travel spaceship speed spinning stars stations structure sunlight surface take-off tanks telescope temperature thousand thrust trolley Uranus vehicle voyage weight weightless