The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 9
... miles is an inconceivably great distance - yet there are also men who think nothing of traveling ten thousand miles in a few days . As speeds of transport have increased , so our sense of distance has altered . Australia can never be as ...
... miles is an inconceivably great distance - yet there are also men who think nothing of traveling ten thousand miles in a few days . As speeds of transport have increased , so our sense of distance has altered . Australia can never be as ...
Pagina 10
... miles away and almost a mile across ; 36 and 67 miles from it , respectively , circle Mercury and Venus . Mercury is 15 feet across , Venus 38— a little smaller than the Earth . Beyond the Earth's orbit is Mars , 20 feet in diameter and ...
... miles away and almost a mile across ; 36 and 67 miles from it , respectively , circle Mercury and Venus . Mercury is 15 feet across , Venus 38— a little smaller than the Earth . Beyond the Earth's orbit is Mars , 20 feet in diameter and ...
Pagina 13
... miles - or , roughly speak- ing , where the air pressure is more than one - fiftieth of its sea - level value . Balloons can function at considerably greater altitudes - up to 25 miles if only carrying very light instruments - but ...
... miles - or , roughly speak- ing , where the air pressure is more than one - fiftieth of its sea - level value . Balloons can function at considerably greater altitudes - up to 25 miles if only carrying very light instruments - but ...
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