The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 70
... reach the Moon's orbit , it must leave the vicinity of the Earth at a little less than full escape velocity - 24,900 mph instead of 25,000 mph . The difference may appear to be trivial , and so it is as far as fuel requirements are ...
... reach the Moon's orbit , it must leave the vicinity of the Earth at a little less than full escape velocity - 24,900 mph instead of 25,000 mph . The difference may appear to be trivial , and so it is as far as fuel requirements are ...
Pagina 76
... reach orbital velocity . In the case of the Moon , this is 3,700 mph ( thus even a V - 2 rocket could quite easily have become a lunar sub - satellite ! ) . The ship might then be refueled either by a tanker from Earth which had been ...
... reach orbital velocity . In the case of the Moon , this is 3,700 mph ( thus even a V - 2 rocket could quite easily have become a lunar sub - satellite ! ) . The ship might then be refueled either by a tanker from Earth which had been ...
Pagina 93
... reach escape velocity in as leisurely a fashion as one pleased . This is clearly not practicable , but some- thing not far from it would be achieved if the spaceship rose ver- tically for the first fifty miles and then veered eastwards ...
... reach escape velocity in as leisurely a fashion as one pleased . This is clearly not practicable , but some- thing not far from it would be achieved if the spaceship rose ver- tically for the first fifty miles and then veered eastwards ...
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