The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 29
... figure , we must develop more powerful fuels , or employ vehicles with more than one stage of propulsion . Before leaving the rocket for the moment , it may be advisable to look a little more closely at the operation of the motor to see ...
... figure , we must develop more powerful fuels , or employ vehicles with more than one stage of propulsion . Before leaving the rocket for the moment , it may be advisable to look a little more closely at the operation of the motor to see ...
Pagina 44
... Figure 10 are the easiest is not hard to see : the rocket has to " take off " and " land , " if one can extend these phrases to 73.000 m.p.h. 48,000 m.p.h. 84,000 m.p.h. EARTH 66,000 m.p.h. SUN MARS 54,000 m.p.h. EARTH 66.000 m.p.h. ...
... Figure 10 are the easiest is not hard to see : the rocket has to " take off " and " land , " if one can extend these phrases to 73.000 m.p.h. 48,000 m.p.h. 84,000 m.p.h. EARTH 66,000 m.p.h. SUN MARS 54,000 m.p.h. EARTH 66.000 m.p.h. ...
Pagina 97
... [ Figure 16 ( a ) ] spinning about its axis . Then , if there is no other force acting— that is , if the ship is in " free orbit " -it will seem to the crew that the circular wall is " down . " They will be able to walk around on it and ...
... [ Figure 16 ( a ) ] spinning about its axis . Then , if there is no other force acting— that is , if the ship is in " free orbit " -it will seem to the crew that the circular wall is " down . " They will be able to walk around on it and ...
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