The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 15
... Gravity with Distance ។ This picture of gravity as producing a hill , up which we have to climb to get away from the Earth , is a very useful one , and we will employ it again later . In the meantime , Figure 2 will give some visual ...
... Gravity with Distance ។ This picture of gravity as producing a hill , up which we have to climb to get away from the Earth , is a very useful one , and we will employ it again later . In the meantime , Figure 2 will give some visual ...
Pagina 31
... GRAVITY , like the air we breathe , is one of those natural phenomena we take for granted and never think about in the ordinary course of events . It is a major factor in the lives of steeple- jacks and mountaineers , but those of us ...
... GRAVITY , like the air we breathe , is one of those natural phenomena we take for granted and never think about in the ordinary course of events . It is a major factor in the lives of steeple- jacks and mountaineers , but those of us ...
Pagina 50
... gravity with distance from the Earth . One could , and usually would , feel weightless in a rocket a couple of hundred miles up , where the force of gravity is practically the same as here on the Earth's surface . The reason for this ...
... gravity with distance from the Earth . One could , and usually would , feel weightless in a rocket a couple of hundred miles up , where the force of gravity is practically the same as here on the Earth's surface . The reason for this ...
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