The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 49
... least if the empty steps were allowed to fall freely . Alternatively , some kind of parachute landing might be em- ployed , so that the lower stages of the rocket could be used again and would not be a source of danger . The best ...
... least if the empty steps were allowed to fall freely . Alternatively , some kind of parachute landing might be em- ployed , so that the lower stages of the rocket could be used again and would not be a source of danger . The best ...
Pagina 132
... least one goes nearer the Sun than Mercury . But the majority stay in the zone between Mars and Jupiter . The total number of asteroids , of all sizes , must run into at least five figures . Until recently , astronomers were unable to ...
... least one goes nearer the Sun than Mercury . But the majority stay in the zone between Mars and Jupiter . The total number of asteroids , of all sizes , must run into at least five figures . Until recently , astronomers were unable to ...
Pagina 174
... least 20,000 times as intense as the Earth's . Falling in such a field , one would be accelerating more rapidly than a shell while it was being fired from a gun , but there would be no feeling of strain whatsoever . If we can ever ...
... least 20,000 times as intense as the Earth's . Falling in such a field , one would be accelerating more rapidly than a shell while it was being fired from a gun , but there would be no feeling of strain whatsoever . If we can ever ...
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