The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 90
... million million millionth of that of air at sea level . For all practical purposes , this is a perfect vacuum : certainly the " interstellar gas " will be of no importance in travel between the planets , though , as we shall see in ...
... million million millionth of that of air at sea level . For all practical purposes , this is a perfect vacuum : certainly the " interstellar gas " will be of no importance in travel between the planets , though , as we shall see in ...
Pagina 159
... million - fold greater than terrestrial ones , interstellar distances are a million times greater still . Even light , which can pass from the Sun to Pluto in a few hours , takes over four years to reach the nearest of the stars . It is ...
... million - fold greater than terrestrial ones , interstellar distances are a million times greater still . Even light , which can pass from the Sun to Pluto in a few hours , takes over four years to reach the nearest of the stars . It is ...
Pagina 164
... million times less dense than our at- mosphere : they have been picturesquely christened " red - hot va- cuums " ! At the other extreme are stars whose density is thousands of times greater than any substance on Earth . The best - known ...
... million times less dense than our at- mosphere : they have been picturesquely christened " red - hot va- cuums " ! At the other extreme are stars whose density is thousands of times greater than any substance on Earth . The best - known ...
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