The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 124
... observed even across the millions of miles of space which separate us from the planet . In the telescope Mars shows three main types of surface mark- ing . Most prominent are the brilliant polar caps , which wax and wane alternately in ...
... observed even across the millions of miles of space which separate us from the planet . In the telescope Mars shows three main types of surface mark- ing . Most prominent are the brilliant polar caps , which wax and wane alternately in ...
Pagina 126
... observed : it is about twice as abundant on Mars as on Earth . Water vapor has not been detected in the atmosphere , but infrared bands due to ice have been observed in the polar caps . The air pressure at the surface of Mars is ...
... observed : it is about twice as abundant on Mars as on Earth . Water vapor has not been detected in the atmosphere , but infrared bands due to ice have been observed in the polar caps . The air pressure at the surface of Mars is ...
Pagina 150
... observe the primary radiations . Our knowl- edge of the ionosphere , which is of great practical importance in radio ... observed visually from the Earth . For centuries navigators have found their way over the surface of this planet by ...
... observe the primary radiations . Our knowl- edge of the ionosphere , which is of great practical importance in radio ... observed visually from the Earth . For centuries navigators have found their way over the surface of this planet by ...
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