The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 13
... limit to the height at which conventional aircraft can ever operate . That limit is between 15 and 20 miles - or , roughly speak- ing , where the air pressure is more than one - fiftieth of its sea - level value . Balloons can function ...
... limit to the height at which conventional aircraft can ever operate . That limit is between 15 and 20 miles - or , roughly speak- ing , where the air pressure is more than one - fiftieth of its sea - level value . Balloons can function ...
Pagina 49
... limit to the atmosphere , we will define it as meaning " a level where frictional resistance is so small that a body would remain safely in its orbit for as long as required . " This level need be little more than a hundred miles up for ...
... limit to the atmosphere , we will define it as meaning " a level where frictional resistance is so small that a body would remain safely in its orbit for as long as required . " This level need be little more than a hundred miles up for ...
Pagina 174
... limit is a fundamental one , of a completely different character from the so - called " sonic barrier " which seemed ... limits set by the laws of Nature ( and we must assume that eventually these limits will be reached , even though we ...
... limit is a fundamental one , of a completely different character from the so - called " sonic barrier " which seemed ... limits set by the laws of Nature ( and we must assume that eventually these limits will be reached , even though we ...
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